Priora 16 valve engine with Hall air conditioning gets hot

(09/03/13) Daniil I recently purchased a VAZ 2170 (Priora) and overall I’m quite pleased with everything. But if you stop without turning off the engine, the temperature sensor shows 98, or even 100ºС. The same thing happens when driving in first and second speed. What should you do in this situation?

First of all, you need to find out what the operating temperature of the engine is, and what it is for the VAZ 2170. The car’s engine is equipped with a cooling system, inside which coolant circulates. The temperature of this fluid is the working temperature for the engine and is measured by a special sensor, and information about its value is displayed on the dashboard. What operating temperature of the Priora engine is considered average? When driving at a speed of 80 km/h, in a normally loaded vehicle and with environmental conditions not exceeding 20ºC, the coolant temperature is 95ºC. When the liquid heats up to 102ºС, the fan turns on, providing additional cooling. Thus, you have no reason to worry - your car's power plant is working normally. Overheating will be indicated by the indicator needle entering the red part of the scale.

It happens that the temperature sensor is faulty. What are the symptoms of engine overheating and what should you pay attention to:

• if in winter warm air suddenly stops flowing into the cabin, then perhaps the level of coolant in the power unit has dropped and it has stopped flowing into the heater;
• black puffs of smoke from the exhaust pipe and knocking may indicate detonation of the internal combustion engine, which can also be caused by its overheating;
• a sharp drop in engine power.

Most drivers, when overheating, immediately stop the car and turn off the engine. In fact, immediate stopping of the engine is necessary only in one case - if the cooling system has depressurized and its liquid is pouring out. In all other situations, the driver’s actions must be as follows:

1. Turning on the interior heating at maximum power. Due to this, the fluid temperature will drop and the engine will begin to cool faster.
2. Having turned on the emergency lights and depressed the clutch, try to smoothly roll to the side of the road or leave the roadway altogether.
3. Let the engine idle for a couple more minutes without turning off the heating system.

After stopping the engine completely, you need to let it cool for 20-30 minutes (depending on the ambient temperature), after which you can measure the coolant level and, if necessary, add antifreeze to the cooling system.

Do not open the radiator cap immediately after stopping the engine! The liquid in it is under pressure and can cause serious burns. If for some reason the plug of a still hot radiator needs to be unscrewed, then it must first be wrapped in a thick rag in several layers. Further actions depend on the cause of the overheating and whether it can be eliminated on site or whether it is necessary to contact service.

A car engine is equipped with a cooling system that contains liquid. The temperature of this liquid is measured by a sensor. This value that it records is the engine operating temperature (ERT). The data recorded by the sensor is displayed on the dashboard. The average operating temperature of a Priora car engine is 95 degrees. This indicator is optimal when the car is moving at a speed of approximately 70-80 km/h and provided that the ambient temperature is not higher than +20 degrees. When the liquid heats up to 100 degrees, the fan turns on, which is designed for additional cooling. With such indicators, it is time to say that the power plant of the machine is functioning without failures. In winter and summer, the RTD may be different. Which RTD is considered optimal for this car? The average is 85-90 degrees.

If the fan does not turn on

If the RTD has risen to 100 degrees and the indicator needle has entered the red part of the scale, this indicates overheating. Perhaps this phenomenon occurred due to the fact that the fan did not work. If you find that when it overheats, the fan does not start working and the temperature does not drop, you need to check the serviceability of the fan itself. It is necessary to determine whether the switch-on sensor is triggered when the normal RTD is exceeded? First, start the engine and disconnect the wires from the temperature sensor that is installed on the engine. When the wires are disconnected, forced cooling should work. If this does not happen, most likely the fault lies in the electric motor of the device. How to check the operation of the fan, watch the video.

If the fan turns on after disconnecting the wires, it means there is a problem with the fan switch sensor. Perhaps it incorrectly perceives data about the RTD and therefore does not operate at the right time.

This malfunction is quite easy to fix: you just need to replace the sensor. After replacing it, check if the fan turns on. To do this, start the engine. When the RTD reaches normal levels, do not turn off the engine until the temperature exceeds the norm. As soon as this happens, the fan should be activated. If the fan operates at a temperature above 97 degrees, but less than 100 degrees, then the system is functioning properly.

Why does the engine on a VAZ-2112 16 valves get hot: reasons, photos

Every car owner was faced with the fact that the 16-valve VAZ-2112 engine began to heat up. If you look at the dashboard indicator, the arrow tends to the red zone, and liquid boils in the expansion tank - this means that there is a malfunction in the cooling system.

Causes of engine overheating

The temperature indicator needle has entered the red zone, which means the engine is overheating

Many car enthusiasts remember the reasons for the effect on old Zhiguli cars. On 16-valve engines, the reasons for this effect are almost the same. Let's consider what reasons may cause the main power unit to begin to overheat:

All these problems can cause the engine to overheat.

Elimination methods

To eliminate the causes of engine heating, it is necessary to establish the epicenter of the effect. To do this, it is worth checking each node sequentially. After identifying the problem, it is worth finding the exact cause and eliminating it. So, let's consider the sequence of actions.

Engine cooling system diagram

Radiator and pipes

One of the reasons for engine overheating may be that the radiator and pipes become clogged, which affects the circulation of fluid in the system, and can also lead to cracks in the pipes and breakdown of the radiator, which will lead to leakage of coolant.

If there is insufficient coolant in the system, the power unit will heat up faster and take a long time to cool down, and the cooling fan will run almost continuously.

Radiator and cooling system pipes

The method for solving the problem is quite simple - dismantling the radiator from the system and cleaning it both outside and inside.

The second stage will be to inspect the pipes for leaks and replace worn-out products. As practice shows, many motorists install kit kits (tuning versions) of the radiator and pipes to extend the service life of the cooling system.

Pump (water pump)

One of the main reasons for overheating is that there is backlash in the water pump . It is quite easy to determine this malfunction, because a corresponding howl appears in the pump area. Also, a sign of a malfunction may be that liquid begins to leak from the pump shaft. The problem can be fixed quite easily by replacing the water pump.

Engine mounted water pump

Cooling sensor

The cooling temperature sensor is a harmless breakdown that can lead to the indicator on the instrument panel showing incorrect data, so the driver will not even know that the engine has overheated until it boils on the road.

Typically, this malfunction is accompanied by many associated factors, so it is quite difficult to miss it. There is only one solution to the problem - replacing the cooling system sensor and resetting errors that occurred in the ECU.

Fan

The last cause of overheating, especially in the summer, is the cooling system fan.

The fan under the hood is indicated by an arrow

So, a breakdown of this unit can cause the engine to overheat and the coolant in the expansion tank to boil.

In this case, the consequences can be very diverse, well, you need to check the fan for serviceability, as well as the sensor for turning it on - that’s for sure. This part fails quite rarely, and therefore the reason for the failure may be a simple fuse or a wiring fault, which can be easily fixed.

Consequences of untimely elimination of defects

Not all drivers realize what consequences can be caused by an engine overheating, and continue to drive with a constantly running fan or frequent overheating.

So, the consequences of strong engine heating are divided into 3 stages, which are worth considering separately.

Slight overheating

If the engine overheats for up to 10 minutes, the consequences may be minor. Thus, cracks will appear in the pipes of the cooling system, the temperature sensor will fail, the oil scraper rings will become deformed, and the valve and camshaft seals will melt. Also, the valves will burn out, and oil will enter the combustion chambers, which will be marked by the release of black smoke from the exhaust system.

Consequences of mild overheating, namely burnout of valves

Significant overheating

With significant overheating, deformation occurs, or rather deflection of the cylinder head. To eliminate these consequences, you will have to dismantle the cylinder head and submit it for surface grinding. Thus, it turns out that the block head is subject to major repairs.

Burnout of the piston group due to significant overheating Measuring the deflection of the cylinder head using a ruler

Severe overheating

With severe overheating, the walls of the cylinder block become deformed and burn out, causing melting of the piston group, deformation of the connecting rods, or even breakage of the crankshaft. Thus, the engine cannot be repaired, since usually the walls of the power unit collapse and their restoration is impossible.

Burnout and deformation of pistons after severe overheating Melting of the walls of the cylinder block after overheating

conclusions

The causes of heating and overheating of a 16-valve engine have been identified and methods of elimination have been discussed. Thus, untimely repair of this unit can lead to the fact that the engine will finally fail and will need to be replaced. Therefore, if the first signs appear that the cooling system has failed, it is necessary to find and eliminate the cause, since a replacement will be much more expensive.

Temperature sensor malfunction

The reason that the liquid in the cooling system, which serves as an air conditioner for the car's power plant, does not heat up or overheats is due to the failure of the temperature sensor.

Often signs of such a malfunction are:

1. Stopping the flow of warm air into the car interior, which occurs due to the cessation of fluid flow into the heater.
2. Dark, almost black smoke comes out of the exhaust pipe. This indicates engine detonation, which was a result of overheating.
3. Engine power drops sharply.

Many drivers quickly stop the car when it overheats and turn off the engine. In fact, an immediate stop of the machine is required only if the tightness of the system is broken and liquid pours out of it. In other situations, the driver must perform the following actions:

• turn on the heating to maximum so that the fluid temperature drops and the engine cools down quickly;
• drive smoothly to the side of the road;
• Let the engine idle for 2-3 minutes with the heating system on.

After this, the engine must be turned off and allowed to cool for 20 minutes. After this, you need to measure the fluid level in the cooling system and add it if necessary. Immediately after the engine is turned off, you cannot open the radiator cap, as you can get burned from contact with the liquid. If the fluid level is normal, then the cause of overheating must be determined by diagnostics. To do this you will have to visit a car service center.

The VAZ 2170 model received several power plants, but the most popular engine in the Priora is a gasoline unit with 16 valves and a volume of 1.6 liters. On various automotive forums it is called briefly - 126 (number). Responsible drivers spend a long time thinking about which car to buy, and the engine plays an important role in this matter. Service life, operating temperature, price of a new motor, analysis - our review will answer all these questions.

What to do if the engine has already started to overheat

If overheating has begun or is suspected, it is necessary to take immediate action to avoid serious problems with the engine in the future.

If the needle has just entered the red zone (overheating zone), then you can turn off the engine, but it is advisable to cool it a little by turning it on to the maximum temperature and blowing on the stove.

In any case, it is necessary to inspect the radiator and engine compartment. If there is liquid in the expansion tank, then you can cool the engine a little by turning on the heater fan to the maximum temperature and blowing mode.

If there is a complete absence of coolant in the tank, turning on the heater at maximum mode will not help cool the internal combustion engine, and may worsen the situation. In this case, it is necessary to turn off the engine and transport the car to the repair site using a tow truck.

If minor leaks are detected in the cooling system after the engine has cooled, it is possible to add water or coolants. Under no circumstances should you add any liquid to the expansion tank of a hot engine, since the difference in temperatures can lead to cracks in different components of the internal combustion engine or other consequences.

It is strictly forbidden to water the engine, since in this case its repair is inevitable due to the appearance of cracks in the cylinder block body.

An overheated engine is turned off only in certain cases: when steam appears from under the hood, indicating a significant leak in the cooling system, or a complete absence of coolant in the tank.

Even a slight overheating of the motor, at best, will lead to unpleasant consequences in the future, and significant overheating can almost completely destroy its insides, which will lead to the need to install another motor.

Such situations can be prevented; to do this, it is necessary to constantly monitor the coolant level, do not pour water into the cooling system, change the cooling pump and working fluids in a timely manner, regularly inspect the pipes for the appearance of cracks in them, and monitor the cleanliness of the radiator and engine housing.

Source

Work resource

The manufacturer states that the 126 by 16 valve engine can operate stably for 200 thousand kilometers. After this limit, the power plant requires major overhaul. But do not forget that AvtoVAZ is a real lottery; for some Priora owners, the engine caught a wedge at 2 thousand. But if you take care of your Lada car, regularly perform maintenance and replace damaged components, then you can safely count on a service life of 150-200 thousand km.

The resource of the power plant is influenced by many factors, here are some of them:

• Overheating . Running the engine on a Priora at elevated temperatures significantly reduces its service life. The operating temperature, which we will talk about in the next section, must be maintained at the same level.
• Fuel . The instruction manual indicates what kind of gasoline should be poured into engine number 126 with 16 valves. It is also recommended to visit only trusted gas stations that will not fill you with diluted fuel.
• Engine oil . Everything is simple here - change the lubricant in a timely manner and buy high-quality oils, then the service life will be 150-200 thousand km. For the 16 valve unit 126, semi-synthetics (Lada recommendation) and synthetics are suitable. The oil needs to be changed once a year or every 15 thousand kilometers; as you can see, the fluid does not have a long service life.

Signs, causes and consequences of car engine overheating

One of the most dangerous and common problems that entails serious consequences in the form of a major overhaul of the internal combustion engine or its replacement is engine overheating. This problem mainly occurs in the summer, but some faults can cause this problem in cooler periods. It is easier to avoid overheating of the car's heart than to later eliminate the serious consequences of even a single excess of operating temperature. To do this, you need to know the symptoms and ways to quickly eliminate such a problem.

Engine operating temperature

We have learned the resource, now we move on to another important indicator. The optimal operating temperature is 90-95°C. After 97°C, engine number 126 with 16 valves will “slow down” a little, but according to the rules, temperatures up to 100°C are considered normal. If the Lada unit is operated with this indicator, then you need to be sure that the radiator fan is running at this time. When you see an indicator below +90°C on the dashboard, you need to assume that this is underheating. Of course, in cold weather the power plant needs more time for the temperature to reach normal levels.

• Operating temperature – 90-95°C.
• Normal temperature (engine runs worse) is 97-110°C.
• Reduced temperature – 90°C and below.

Are the valves bent?

Each engine in a Lada Priora car bends a valve, this also applies to the most powerful unit number 126 by 16. They will tell you this in any service center that services domestic cars. But novice drivers should know that the engine bends components for a reason, and if you follow the operating rules, you will not encounter this problem.

The Lada power plant bends parts only if the routine work to replace the belt and other components of the gas distribution mechanism (GRM) is violated. The motor bends the valve if the rollers, belt or water pump were not replaced in time. When one of these elements breaks, the number 126 pistons meet the valves. Due to this design feature, the motor bends the parts. The solution to the problem is a major overhaul of the Lada.

So, the task of the owner of a Lada Priora with engine number 126 for 16 cl is to check the timing belt in a timely manner.

The condition of the belt should be checked every 50 thousand kilometers (according to the factory recommendations - 100 thousand) - there should be no cracks, delaminations, or breaks on it. If they are present, the belt must be changed urgently. Mandatory repairs take place after 200 thousand kilometers.

The rollers and timing pump number 126 should also be given attention when inspecting the belt. After all, the engine bends parts even with faulty rollers. Sometimes the timing belt and its components wear out prematurely - you will know this by vibrations from the engine compartment and an unpleasant grinding noise. Engine number 126 bends the valve, so do not forget to change the timing components in time and repair this unit.

Bad thermostat

In hot weather, this element can also affect engine overheating. If there is a malfunction of the thermostat, the engine begins to heat up longer, and while on the road it constantly increases its operating temperature. Therefore, if the engine heats up at speed, most likely the cause is the thermostat. A low-quality part may simply jam. As a result, the half-open element is unable to ensure normal heat exchange and circulation of coolant at high speed. The way out of the situation is similar to the first case - the faulty element must be replaced. By the way, many owners of domestic cars in the summer simply remove the thermostat and drive without it. The engine of such cars does not heat up throughout the hot season. Well, with the onset of autumn, motorists again install this element in its regular place.

Note that the engine does not always heat up due to the thermostat. Perhaps the reason for this may be the lack of coolant in the system (we'll talk about this a little later). Therefore, the thermostat is always tested for functionality before replacement.

This can be done without removing it from the engine compartment. When, when the engine is running, the upper pipe (the one that goes to the cooling radiator) is cold or extremely hot (so much so that it is impossible to touch it), accordingly, the part does not allow liquid to pass through it. The replacement of the thermostat itself is carried out only when the engine has cooled down.

There is another way to diagnose a thermostat. It consists of using a pan of water and a gas stove. When the liquid in the container is about to begin to boil, the thermostat located in it should open within a few seconds.

If this does not happen even when the water boils, it means that the device is inoperative. Thermostats cannot be repaired.

How much does engine No. 126 cost?

As it turns out, buying a new 16-valve unit for a Lada Priora is an expensive proposition. Today you can purchase a 16 valve 1.6 liter EURO-3 and EURO-4 engine. The first option costs approximately 102 thousand rubles, and the second – 103 thousand. Motorists are also interested in how much it costs to purchase a used Lada unit. Used ones can be purchased even for 20 thousand rubles. But you can find out what condition this unit is in only after a complete disassembly or a trip to a car service center. The average price for a used one is 50-60 thousand rubles.

Replacing elements

Structurally, the Lada Priora engine cooling system has a simple design. Therefore, we will consider replacing only individual components, with which certain difficulties are possible, especially for beginners.

Replacing the cooling system radiator

This unit on cars rarely changes. Typically, this procedure is necessary when a leak occurs that cannot be eliminated. Its service life can be 10 years or more. Cases when replacing the radiator are simply necessary are as follows:

Engine disassembly and repair

Repairs are carried out according to the standard procedure - we find faulty parts and replace them with working ones. The instructions below describe the process of disassembling the unit itself; before that, you need to dismantle it from the Lada Priora and thoroughly clean it of grease and dirt.

From the tools we will need regular and ring wrenches, a ratchet with an extension, screwdrivers, a pry bar and a stand. It is best to carry out repairs in a garage with good lighting.

Instructions

1. Using the 13th key, remove the bracket fastenings. 4 nuts hold the front cylinder block support;
2. We remove the bracket and move on to the left support - it is removed in exactly the same way;

Thus, you can completely disassemble the 16-valve engine and repair and replace faulty parts. But if the unit bends the valve, then only an experienced mechanic can handle the malfunction with his own hands. In any case, you will find out whether the motor bends the valves or not after removing the head cover.

Guys, tell me, when driving at first, second speed and in traffic jams, the engine temperature quickly rises to 100, 107 degrees, when driving at high speed the temperature drops to 85 - 90? This is especially noticeable now, in the spring, the weather is warm. Is this normal? phenomenon? What will it be like in the summer at plus 40 degrees? Will I overheat the engine? Thank you all in advance!

Hi all! I recently bought a Lada Priora 1.6 16 cl. 2009 with air conditioning. The car is constantly heating up, the temperature is closer to 100°. I changed the pump and timing belt, at the same time drained the entire system (the plug option is excluded, I think), the thermostat was changed, the pipes are all hot.

Tell me what the reason is.

And another question, maybe someone had! I did a full diagnosis of the injector, the result: not a single error, engine operation is smooth, system pressure is 4, the gasoline filter has been changed. But the car doesn't pull anything? What could this be, what should I do?

Thank you all in advance) I’m already thinking about selling it!

Why does the engine get hot on a 16-valve Priora?

View full version: Engine gets hot. What could be the reason?

Hi all. car 99. The engine constantly warms up and the Carlson switches on. I already got it) I didn’t notice this back in the fall. Antifreeze level in the expansion tank is at MAX. You have to constantly turn on the heater at 2nd speed so that the engine cools down somehow. If I switch the fan to cold air, the temperature immediately goes off scale. Today I actually started sneezing (I think I overheated), because... the temperature was about 115 degrees. Then it stood for a while - it cooled down and everything was gutted. who can advise? What can be wrong? Maybe some tap is closed somewhere? because More than once after that the car was at 100 and the mechanics could fix it.

If warm air comes from the stove, then the thermostat can probably be removed immediately. Maybe it's time to clean the radiator? Does the antifreeze look normal? Have you changed it recently?

look at the thermostat, is the radiator hot or cold, could there be a plug somewhere or clogged...

The stove blows as it should. I'm tired of turning it on to mode 2 and lowering the window. The radiator was replaced with a new one a year ago. I don't think I managed to get clogged, though. Antifreeze flowed well back in the summer (I replaced the pump and antifreeze (I had Felix and mixed it with GOST))

The radiator is hot or cold, there may be a plug somewhere, or it may be clogged..

+1 Then watch this.

look at the impeller on the pump.

The radiator is cold. Only a little warm on the sides.

Well, the reason was found, it’s either the thermostat, touch it when it’s warm in the part where the hose is connected to the radiator, or the radiator is clogged, or something else is clogged - take it apart, wash it. Maybe it was leaking somewhere, sealant was poured into the system? the traffic jam is unlikely...

thermos for replacement. the large circle does not open. The car apparently has an injector, the brains are turning on the fan, but there is nothing to cool.

yes, the car is fuel injected. Are there any taps on the approach or outlet of the radiator?

thermos for replacement. the large circle does not open. The car apparently has an injector, the brains are turning on the fan, but there is nothing to cool. Most likely.

Are there any taps on the approach or outlet of the radiator? only the stove has a faucet

The thermostat is a faucet) depending on the temperature of the engine it decides to open a large circle or close it) apparently it’s jammed. does not open to the large circle (through the radiator)

and there are no taps on the approach or exit from the radiator? On ZILs of the 60s there was a manual drive for the curtain in front of the radiator. After that, it seems, there were no manual adjustments in the Soviet automobile industry.

On ZILs of the 60s there was a manual drive for the curtain in front of the radiator. After that, it seems, there were no manual adjustments in the Soviet automobile industry. There were) I had such a thing on my GAZ-24 (1984)) it’s very convenient in winter)

thermos for replacement. the large circle does not open.

If the antifreeze does not circulate in a large circle, then the stove will not heat. Or am I driving?

If the antifreeze does not circulate in a large circle, then the stove will not heat. Or am I driving? My Priora was still warming up) Well, really it was in the summer, and I had to turn the heater on to maximum.

DTOZH for the pointer on the instrument panel

The operating principle of this sensor is to change the resistance when the internal element heats up. Passing through the indicator on the instrument panel, the current flows through a single wire to the device. And here the principle of induction in coils comes into play. Simply put, the higher the resistance, the more the needle on the indicator rises, due to the circulating currents in the coil located inside the indicator.

Possible malfunctions of the Priora coolant temperature display system

Most motorists, having discovered that the engine temperature gauge needle does not rise, believe that it is necessary to change the sensor. However, you should first make sure that this is the case. After all, there are several reasons for this state of the panel:

• Failure of the pointer on the instrument board.
• Break in the wiring.
• Direct failure of the sensor.

Therefore, it is better to conduct a small check on your own.

Location and serviceability check of DTOZH

This device is located directly above the Priora flywheel housing. The sensor is embedded in the engine block near the thermostat. It is connected to a single wire with a female connector. The test method for this device is very simple. And it has been used by drivers for a very long time. You need to do this:

1. Turn on the ignition.
2. Disconnect the connector from the sensor.
3. Connect the wire to the block body.

If the DTOZH itself is faulty, the indicator arrow will rise to its highest position. But if no changes occur on the instrument panel, then the reason must be looked for elsewhere. Maybe the circuit is broken, the pointer is broken, or the whole combination.

How to replace the Priora coolant temperature sensor

This is a fairly simple operation. It is available to any driver.

Important! Many believe that this requires draining the coolant. But this is not necessary if you act quickly and skillfully. Otherwise, it’s better to drain it anyway. So. Just in case, drain the antifreeze. To do this, unscrew the cap in the radiator. It is located near the generator, below. And a plug-bolt in the engine block. First place the container under the bottom.

To access the right place, it is better to dismantle the air filter. Then the work area will be completely accessible. Prepare a new temperature sensor.

Using a 21 key, unscrew the old one and quickly screw the new one into place. Pour in antifreeze, making sure that no air pockets form. Replace the filter and start the engine. Wait for the fan to operate. At this time, watch the arrow. When you turn on the ignition, it should rise by 2-3 millimeters. And then, according to the degree of heating, smoothly enter the working zone of 92-98 degrees. If this is what happened, then the operation to replace the coolant temperature sensor for the Priora instrument panel can be considered successfully completed.

Useful video on this topic.

• How to replace the ECU coolant sensor on a LADA Priora car
• What is the outer CV joint of the Chery-Amulet car?
• How to change the CV joint boot on a Daewoo Nexia car
• How to change the CV joint boot on a Lanos

The coolant temperature sensor (CTS) in a Priora car performs the function of monitoring the thermal state of the power unit. Thanks to DTOZH, the driver always knows to what temperature the engine is warmed up and whether there is overheating in the system. You can learn more about the principle of operation, as well as replacing the controller, from this material.

The VAZ 21124 engine gets hot in traffic jams, reasons, signs of an overheated engine, what to do

Overheating of a car engine is a problem that every driver can face.

In this article we can find out:

To understand the essence of the issue, it is necessary to consistently read all the explanations of an experienced auto mechanic.

How to determine if the engine is overheated

At first glance it seems very simple - according to the indicators of the engine temperature device, or - sensor. This is true, if not for one thing - novice motorists are so captivated by the road situation around them that they look at the instrument panel only in one case - how much fuel is left.

Experienced motorists, on the contrary, due to their confidence in their abilities, also do not look at the car’s dashboard. And as a result, a situation often arises that overheating is detected when the engine temperature has long exceeded permissible limits, and irreparable damage has been caused to the engine.

It is irreparable overheating that is one of the most complex malfunctions, which leads to very serious consequences. But more on that later.

But there is a way that will not let you miss the moment of overheating. This is problematic in a traffic jam, and is not always clearly present, but here’s what you should be aware of:

As soon as the engine temperature exceeds the permissible norm, when you sharply press the gas pedal, or when accelerating the car, even slightly, detonation knocks are clearly heard, which are popularly called “tapping fingers.” This is not true, but everyone knows this definition. If you hear such a sound, there is a 99% chance that the engine has overheated, and action must be taken.

Detonation knock is a loud metallic knock, the frequency of which coincides with the engine speed. You've probably heard such sounds when refueling with low-quality fuel. I personally don’t know where the concept of “tapping fingers” came from. But the real reason for such knocking noises is a disruption in the fuel combustion process.

When the engine overheats, this is the first sign.

What is the permissible engine temperature

Before continuing the conversation, let's define what is normal temperature and what is overheating. There is no one-word answer, but there are general rules. The engine temperature is within 85-95 degrees Celsius, which is working. Engine temperature up to 100 degrees is acceptable. This means that a short-term increase in temperature to 100, sometimes up to 105 degrees is allowed. Just for a short time - up to 5 minutes. Engine temperature above 105 degrees Celsius means overheating and action must be taken.

Reasons that can cause overheating

During long-term use of the car, the piston rings, which serve to seal the combustion chamber, wear out, which leads to a decrease in compression, impaired fuel combustion, loss of power (remember the formula) and overheating of the car. Somehow it turned out to be too difficult. To put it simply: fuel burns better at a certain pressure that is created in the combustion chamber. Pressure is about 12 atmospheres. If you take a pipe, plug it with potatoes and blow inside, pressure will be created inside, which is called compression.

The force with which you blow will represent the force of expansion of the fuel during combustion, which pushes on the piston and causes the crankshaft to rotate. The rings serve to fit the piston more tightly to the cylinder (in our case, potatoes and tube). Now, if you put in a loose piece of potato and blow, the air will pass past the potato piston. This is what happens in the engine when the piston group wears out (ring wear and cylinder wall wear).

By and large, two troubles can happen to the pump: it will simply leak - you will see, and the second, which is more difficult to determine, is wear of the pump impeller. When the impeller wears out, the pump slowly pumps liquid, as a result, the liquid in the engine heats up faster than in the radiator (water circulation worsens). You can tell by uneven heating - the radiator is cold, but the engine is boiling. Attention - the same symptoms occur if the thermostat is malfunctioning or if there is an air lock.

There may also be other reasons - one of which is from the category “you can’t invent it on purpose.” For example, the parking brake is not fully weakened, which leads to the car slowing down, increasing the load on the engine, and overheating. The handbrake cable may get stuck - there was such a case. The car slows down slightly, but this is enough in the heat.

And some people also blame the air conditioner on. By and large, this is rather a far-fetched reason. Of course, the air conditioner creates additional load on the engine, but this was taken into account during the development. If the engine is really bad - complete wear and tear - then this can happen. What to do - turn off the miracle of modern automobile manufacturing.

Perhaps we'll stop there. The only thing we'll talk about at the end is overheating in a traffic jam. No one is immune from this.

What to do if your car overheats in a traffic jam

When driving a car for a long time in a lower gear, the engine operates with increased power, which in itself leads to overheating. Add to this the lack of counter-flow of air necessary to cool the radiator. What to do? The main thing is not to panic. Short-term overheating is not terrible, but if you see that the car is not cooling down, it’s time to act.

This is what it looks like, engine overheating, if you look closely. Now you know why the engine gets hot and how to deal with it.

Didn't find the information you are looking for? on our forum.

, please select a piece of text and press Ctrl+Enter.

The VAZ 21124 engine gets hot in traffic jams, reasons, signs of an overheated engine, what to do Link to the main publication

Characteristics and features of DTOZH on Priora

Many motorists confuse the DTOZH with a cabin or ambient temperature sensor, but this is completely wrong. The purpose of the DTOZH is to monitor the temperature of the refrigerant in the cooling system.

There are two regulators in Lada Priora cars:

1. One of them is installed on the cylinder head and its purpose is to display information about the engine temperature on the dashboard. Essentially, this is a pointer.
2. The thermostat housing contains the DTOZH, which plays a more important role. This device transmits pulses to the control unit to activate the ventilation device. In addition, it plays an important role in the formation of the combustible mixture during startup of the power unit.

DTOZH for Priora

As for the principle of operation, it is as follows. The main regulator is located in the thermostat housing, which allows for the highest pulse accuracy. Since the DTOZH in any case comes into contact with consumables, that is, antifreeze, it instantly detects changes in temperature and sends corresponding signals to the ECU. The latter, based on the information received, adjusts the operation of the engine and changes the composition of the air-fuel mixture. If there is no or too low level of consumable fluid in the system, the controller will provide incorrect data.

Frequent causes of engine overheating on a VAZ 2110

Engine overheating is not uncommon for a car like the VAZ 2110. This problem mainly occurs in cars with high mileage. Although even with relatively new copies, overheating of the motor cannot be ruled out.

Mileage is often the culprit. As the vehicle is used, parts wear out and systems gradually become unusable.

Common Causes

As you know, the VAZ 2110 is equipped with two types of engines - with 8 and 16 valves. There are several main, most common reasons that cause this overheating of power units.

Let's look at each of the reasons and ways to resolve these problems separately.

Low coolant level

Coolant plays a huge role in the operation of the cooling system. A special substance, namely antifreeze or antifreeze, is poured into the expansion tank.

Related material:

— Replacement of coolant VAZ 2110

In a normal situation, the level of the coolant solution should be at the level of, or rather the MAX marks on the tank body. This indicates that the container is approximately 50-60 percent full.

If there is no such mark on the tank, refer to the clamp. The liquid should reach its upper edge.

temperature sensor

A temperature sensor is necessary in order to respond to changes in engine heating. When a preset point is reached, the sensor is triggered and turns on the cooling fan.

If this device malfunctions, the power unit overheats because the fan does not activate. Consequently, the temperature does not fall below critical levels, but continues to gradually rise.

Related material:

— Coolant temperature indicator sensor for VAZ 2110

If you encounter such a problem on the road (most often the engine overheats when you are in traffic jams, since the engine is running and there is no flow of cooling oncoming air), try to get out of the jam as quickly as possible and find a free section of the road.

Accelerate during the free stretch and then begin engine braking. This will lower the temperature and prevent overheating. Under no circumstances should you regularly operate your car this way. But this is a great way to get to a garage or auto repair shop, determine the cause of the sensor failure, and then replace it.

Cooling Fan

The symptoms of fan malfunctions are similar to a non-working temperature sensor. That is, the engine will heat up, the indicator on the dashboard will be in the red zone.

Related material:

— VAZ 2110 cooling fan does not work

Again, while on the road, we recommend using the engine braking method. Next, head to the garage. Let the car cool down. In the meantime, go to the store for a new fan. This device for the VAZ 2110 costs about 600 rubles.

Fan problems

Other reasons

There are other equally popular reasons for engine overheating. Therefore, we invite you to familiarize yourself with all of them in our table.

When faced with such a phenomenon as engine overheating, do not rush to send your VAZ 2110 for repair to a car service center. You can find many causes of overheating with your own hands and deal with them yourself. Service station services are not cheap these days, unfortunately.

Solving the problem of poor heating by the stove on the Lada Priora

If the stove in the car does not heat well (we are most interested in the Priora at this moment), then this situation causes a lot of inconvenience to the driver and passengers. In the summer, this problem is not relevant, because no one really worries about the condition of the heater. And only with the onset of cold weather does the overwhelming number of motorists become puzzled by the problem of a non-working heating system.

Possible reasons for cold air supply

A common situation is when cold air blows from the Priora stove; there may be more than one reason for this. It is in identifying the malfunction that the main problem lies. There may be several reasons why the stove on a Priora does not blow:

We carry out comprehensive diagnostics

Removing a faulty heater from a Lada Priora is not so easy. Even experienced motorists cannot cope with this task quickly. To avoid doing such a large amount of work in vain, it is better to first diagnose the heating system. You must proceed as follows:

DIY replacement instructions

If the diagnostics showed that the DTOZH is operational, but signs of a malfunction still appear, then, as we have already said, check the quality of the regulator connection and wiring. If, as a result of the check, it turns out that the device is inoperative, then the coolant temperature sensor will need to be replaced. The replacement procedure itself is not particularly complicated; even a novice car enthusiast can handle it.

As you know, Lada Priora cars go on sale in several modifications - with an 8 or 16 valve engine. Therefore, some car owners may think that the replacement procedure will look different in both cases. But we immediately want to dispel doubts - everything will look almost identical - the thermostat housing is located in the same place on both versions of the engine. The only difference is that you will need to dismantle the line that connects the air filter element to the throttle in advance.

So, how to replace the device yourself:

1. First, open the hood of your vehicle and turn off the power to the on-board network; to do this, you will need to remove the cable from the negative terminal of the battery. A small amount of antifreeze can be drained from the radiator so that consumables do not come out when dismantling the DTOZH.
2. Having done this, you need to gain access to the DTOZH. If the pipe between the throttle assembly and the air filter bothers you, it will need to be removed. To do this, disconnect the clamps that are secured with bolts and unscrew them with a Phillips screwdriver.
3. Next, disconnect the chip from the DTOZh output; to do this, you will need to disconnect the mount in advance.
4. After these steps, you will need a head on an extension with a knob. Using this tool, unscrew the regulator itself; this step is shown in more detail in the photo.
5. After the regulator is unscrewed, it must be carefully removed from its seat.
6. Then the new regulator is installed. In order for its fixation to be more reliable at the landing site, you will need a special chemical composition, which is called a thread locker. You can purchase it at any automobile store. Using this substance, the thread of the regulator is processed, after which the device is screwed into the installation location. A connector with wires is connected to it, then the negative terminal of the battery is connected in place, do not forget to add antifreeze to the system. After repairs, it is necessary to check the functionality of the regulator.

1. Disconnect the pipe connecting the throttle and the air filter. 2. Disconnect the DTOZh power connector. 3. Unscrew the regulator and replace it with a new one.

Priora engine overheating. How to fix?

When the engine is running, a properly functioning cooling system maintains optimal temperature conditions.
Malfunctions in the cooling system can lead to engine overheating. If you miss this moment, unpleasant consequences may arise: breakdown of the head gasket, warping of the head and, as a result, complex and expensive engine repairs.

The instrument cluster of any car has a coolant temperature indicator. If the engine overheats, the gauge needle approaches the red zone.

How to check the cooling system

At the first signs of overheating, if the temperature gauge needle has gone into the red zone, but no clouds of steam are escaping from under the hood, turn on the maximum interior heating mode. This is necessary in order to reduce the temperature of the coolant in the engine cooling system.

Turn on the hazard lights, depress the clutch pedal and, using the inertia of the car, try to carefully move to the edge of the roadway and stop as far to the right as possible on the side of the road, and if possible, outside the roadway. Let the engine run for a couple of minutes at normal idle speed with the heater on full blast.

Do not stop the engine immediately! The only condition is to maintain the tightness of the cooling system. If the hose bursts or comes off, or another leak occurs other than fluid escaping from under the expansion tank plug, the engine will have to be stopped immediately!

After stopping the overheated engine, local overheating of the coolant begins at the points of contact with the most heat-stressed engine parts and the formation of vapor locks. This phenomenon is called heat stroke.

Note that on our website there is already a publication about replacing the radiator of the cooling system on a Lada Priora with your own hands.

2. Open the hood and inspect the engine compartment. Determine where the steam is coming from. When inspecting the engine, pay attention to the presence of coolant in the expansion tank, the integrity of the rubber hoses, radiator, and thermostat.

Never open the expansion tank cap immediately. The liquid in the cooling system is under pressure; when the plug is opened, the pressure will drop sharply, the liquid will boil and its splashes can scald you. If you want to open the expansion tank cap on a hot engine, first place a thick thick rag on top and only then carefully unscrew the cap.

The valve of the expansion tank plug plays a major role in ensuring optimal temperature conditions. It maintains an excess pressure in the system of at least 0.1 MPa (1.1 kgf/cm2). In this case, the boiling point of water increases to 120 °C, and the coolant - to 130 °C. Unfortunately, when the valve jams in the closed position due to overheating, a significant excess of excess pressure occurs - more than 0.2 MPa (2 kgf/cm2), which can lead to rupture of the expansion tank or failure of one of the hoses.

Therefore, once a year the expansion tank plug must be washed with running water. If in doubt, replace the plug. Obviously, if you remove the expansion tank cap on an overheated engine and this action coincides with thermal shock, boiling of the liquid and the formation of air pockets in the cooling system will be guaranteed.

Once a year, wash the radiator cells with a high-pressure water jet (using a special washer), directing the stream first towards the incoming air flow, and then in its direction to remove dirt, adhering insects and road debris from the surface of the radiator. In this way, the efficiency of the radiator can be partially restored.

If coolant leaks are detected, the burst hose can be temporarily repaired using duct tape. Reinforced (usually silver-colored) adhesive tape, which can be purchased at auto stores, is especially suitable for this purpose.

A leak in a radiator, thermostat or heater is quite difficult to eliminate on site, so in such a situation it is necessary to add water to the cooling system and carefully monitor the temperature gauge while driving, periodically restoring the level in the cooling system.

Long-term use of water instead of coolant leads to the formation of scale in the engine cooling system, deterioration of its cooling and, as a result, a reduction in service life. Never add cold water to an overheated engine. The engine must cool down with the hood open for at least 30 minutes.

3. The engine may overheat if the thermostat fails, which regulates the flow of fluid in the cooling system through or past the radiator (to speed up the warm-up of a cold engine). To check the thermostat, on a warm engine, check by touch the temperature of the hose connecting the thermostat housing to the radiator. If the hose is cold, the thermostat is faulty and there is no circulation through the radiator.

4. Very often, the cause of overheating of an engine whose cooling system is equipped with an electric fan is the failure of the fan. Start the engine, monitor the temperature and see if the cooling fan turns on when the engine overheats.

5. If the fan does not turn on, the fuse may have blown, the start relay is faulty, the electric motor is burnt out, or the wiring is faulty.

Rated operating temperature of the VAZ 21126 Priora engine

To find out what the normal operating temperature is in the Priora 16 class injection engine, just study the factory technical documentation. It says that according to the International Motor Vehicle Manufacturers Convention, the operating temperature in gasoline engines with an injection power system should be within 90 degrees. Specifically, the Priora VAZ 21126 engine must operate in the temperature range from 87 to 103 degrees.

Temperature sensor Lada Priora

This contributes to the normal correct operation of the power system, maximum engine performance, and in addition, the content of harmful substances in the exhaust gases complies with Euro3 standards that were current at that time. And the engine power, as practice shows, remains within the nameplate limits - about 98 forces at 5.5-5.6 thousand rpm. Again, judging by the reviews, and based on practice, fuel consumption during overheating can increase by 15-25%, and when operating the engine at coolant temperatures below 85 degrees, consumption increases by 10-18%.

Flushing the cooling system of Lada Priora

It becomes dirty and clogged over time and intensity of use. Clogged SOD channels do not allow antifreeze to circulate freely, as a result, heat transfer is disrupted. The stove in the cabin begins to heat poorly, and meanwhile the engine constantly overheats. In these situations, the right solution would be to clean the cooling system. To do this, first of all you need to cool the engine.

The following is the procedure.

1. Drain the coolant (not only from the radiator, but also from the engine jacket, by unscrewing the drain plug on the cylinder block).
2. Fill the expansion tank with any suitable flushing fluid to the optimum level.
3. Start the engine and let it idle for at least 15 minutes.
4. Drain the used fluid.

Then, if necessary, the procedure is repeated. After flushing, all that remains is to fill in fresh antifreeze and remove the air lock from the system. If a more thorough flushing of the system is required, then there is nothing complicated here either. To do this, you will need a regular watering hose connected to the water supply. To flush the radiator, you need to disconnect the lower and upper pipes, insert them into the upper hose and turn on the water. All dirt and rust will come out of the bottom. To flush the engine jacket, you need to do the same steps, but the hose is inserted into the thermostat pipe.

The effectiveness of flushing the system largely depends on the product chosen as a flushing agent.

The simplest option is regular tap water. Add lemon juice to it. Carbonated drinks, such as cola, are also suitable. You can also buy special cleaning products for washing SOD in specialized stores.

When does the fan turn on on a VAZ 21126 and how does it affect engine performance?

Since the VAZ 21126 engine differs only slightly from the main VAZ 2110 (21124) engine, their operating temperature conditions are the same, this applies to all 16-valve VAZ engines. Another thing is that the driver in real time can assess the operating temperature conditions only by two indicators, and even then they are not very objective - this is the arrow of the liquid temperature indicator on the instrument panel and the moment the cooling system fan turns on.

Location of the temperature sensor, this sensor only works on the indicator on the dashboard

Obviously, you can’t tell much by looking at the arrow; its readings are more of a symbolic nature. But the fan on Priora and VAZ 2110 operates at a clearly set coolant temperature. The fact is that the engine control system (ECM) has more accurate temperature data than the driver. These are sensors located in the cylinder block, there are two of them.

One performs a purely decorative function and is responsible for reading the temperature indicator on the tidy. The second one is the main one. Visually, it differs in that two wires are connected to it, rather than one, and it is this wire that reports the actual antifreeze temperature to the ECM. It gives the unit accurate information and sends a command to turn on the fan.

The fan switch sensor is located near the thermostat, above the temperature indicator sensor

At the same time, the engine temperature drops by an average of 5-7 degrees if the Carlson is turned on at half power, and if with full load, the temperature levels out from 105-107 ˚C to a nominal 96-98 degrees, depending on the speed and temperature outside.

Priora heats up at speed

Lada Priora cannot be called a miracle of engineering in terms of technical equipment. For the most part, this model inherited the components and assemblies of its predecessors. The cooling system was no exception. On the Lada Priora it is combined: liquid with partial natural and forced air cooling. In this case, the type of engine does not matter: for the 8-valve and 16-valve power units it is almost identical.

Device and features

The cooling system of the Priora internal combustion engine has a standard set of main components:

By circulating through the large and small circuits, the coolant prevents the engine from overheating, maintaining the desired temperature. Structurally, the cooling system of the Priora is simple and no different from other internal combustion engines with an injector, with the exception of small parts.

Radiator and forced cooling fan

They mainly serve to bring the working fluid to the optimal temperature for the functioning of the engine (the operating temperature of the Priora engine with 16 valves is 90–95 degrees). The predecessor of the Priora VAZ 2110 often installed a cooler made of copper alloys, but due to cheaper prices, designers switched to aluminum analogues.

The operation of the fan depends on the engine control unit.

It receives information from the DTOZH (this is a sensor that reads temperature readings) located in the water jacket of the power unit. If the permissible temperature values ​​are exceeded, the control unit connects an electric fan to improve cooling efficiency. A faulty fan or clogged radiator can lead to a constant increase in optimal engine temperatures, which shortens the service life and can cause costly repairs.

Thermostat

Its task is to promptly open coolant access to a large circle of the engine cooling system (engine cooling system) after the engine reaches the optimal temperature. In simple terms, the thermostat allows you to quickly warm up the engine and regulates the operation of the entire system. During warming up, the thermostat valve is in the closed position, antifreeze does not flow through the large circuit (the radiator is not activated). As it warms up, the valve opens slightly under the influence of rising temperature, and antifreeze begins to move through the radiator along a larger circuit.

A thermostat malfunction can result in overheating of the power unit (if the valve is stuck closed) or, conversely, the operating temperature rises very slowly (when the valve is stuck in the open position). Overheating is much more dangerous. Beginners can identify this malfunction if the engine heats up all the time and the fan on the Priora is constantly running.

Pump (water pump) and heater

Without the first part, the coolant circulation circuit in the system is impossible. If the water pump is faulty, at best there will be a coolant leak from the system. In the worst case, the pump may jam, which will lead to a broken timing belt and subsequent problems, the solution of which will result in expensive repairs.

The heater, or simply the stove, consists of a radiator, pipes and a fan. Can additionally cool the antifreeze in the system. An indispensable unit in winter. Provides the interior with warm air.

Connecting elements and expansion tank

It serves as a receiving compartment where gases and vapors are discharged when the coolant is heated. Also, the expansion tank is the level for the entire cooling system. One of the main elements in the tank is the valve cover through which air is forced out. There is antifreeze, it begins to boil when the engine temperature rises critically.

The connecting hoses serve as a pipeline for the circulation of coolant and connecting elements of all structural units, thus creating a single looped and sealed circuit.

The design of the cooling system also includes an engine temperature sensor on the Priora and an engine jacket. The sensor constantly reads information about the current antifreeze temperature and transmits it to the ECU. The location of the power plant jacket is structurally assumed in the cylinder block housing; it serves to remove heat through the coolant.

Features of cooling system malfunctions

The efficiency of the structure primarily depends on the level of antifreeze in the system and its condition (this liquid has a certain resource, usually up to three years or up to 50,000 km). The main sources of system malfunctions are the thermostat, radiator and electric fan, as well as the water pump, the principle of operation of which is described above.

The radiator most often becomes the source of antifreeze leakage. Accordingly, the liquid level in the system drops, and there is not enough of it for effective heat removal. The motor begins to overheat. It can also be clogged with garbage. And if water is used instead of antifreeze the old fashioned way, scale may form.

The consequences of a faulty water pump are much more serious. In addition to antifreeze leakage, the circulation of coolant in the system may stop and, as a result, the engine will quickly overheat. The worst case scenario is bent valves due to a broken timing belt.

The next common malfunction is burnout of the cylinder head gasket or deformation of the cylinder head of the internal combustion engine system. This leads to coolant entering the fuel combustion chambers. The same thing can happen if cracks appear on the cylinder block.

Coolant leakage is most often associated with loss of tightness of the connecting pipes, because over time, the material from which they are made hardens and wears out, as a result of which it cannot work properly.

On a Priora, a lot depends on the computer, and a faulty coolant temperature sensor can give incorrect readings. For example, if the ECU receives underestimated performance, the engine will begin to overheat. Otherwise, the fan will be constantly on. On the other hand, often the cooling system sensor does not transmit any readings at all. Then the ECU switches the operation to emergency mode.