Volume and principle of operation of the VAZ-2109 cooling system

Cooling system features

The car engine cooling system is designed by designers to perform several vital functions. But, in some cases, especially on high-mileage vehicles, this system is a weak point.

There are three main types of cooler:

1. Water.
2. Antifreeze.
3. Antifreeze.

The first is practically no longer used, as it boils away quickly, causes damage to metal parts of the engine and is dangerous when used in the cold season. The second is the most common and inexpensive. It is produced from inorganic compounds, which creates an oil film on the engine walls, which significantly reduces thermal conductivity.

If problems constantly arise in the cooling system, it is most practical to use antifreeze, since it is more financially profitable

Owners of VAZ 2109, 2108 and VAZ 21099 cars, no matter whether carburetor or injection, are more likely than others to encounter this problem. The most common breakdowns are:

• Radiator leak.
• Cooler tank failure.
• Pump malfunction.
• Damage to the interior heater radiator.
• Coolant slagging.

Liquid pump

This is an element of the VAZ-2108 cooling system with a carburetor or injector, which allows for the best circulation of antifreeze through all pipes.

It is driven by the timing belt. Cooling system pump design:

1. Aluminum alloy body.
2. Axle mounted inside the housing.
3. To ensure that the axle rotates normally, a bearing or bushing is installed. To prevent liquid from leaking out of the system, a seal is installed.
4. On the outside of the axis there is a toothed pulley, which is driven by a timing belt.
5. An impeller is installed on the inside. On cheap pumps they are made of plastic, on more expensive ones they are made of metal.

Perhaps these are all the elements of the coolant pump; you only need to mention the three mounting bolts and the paronite gasket.

The procedure for replacing coolant on a VAZ 2109-2108

So, the first thing you need to do is unscrew the cap in the expansion tank to relieve pressure in the system - this will allow antifreeze or antifreeze to drain faster:

Then we put a thin hose on the outlet of the radiator tap, which is located in the lower right corner and turn off the tap:

And at the same time, lower the end of the hose into the drain container. Personally I did it like this:

At the same time, you can immediately unscrew the plug in the engine block with a key number 13:

And substituting another container, we wait until all the coolant drains from the block and the cooling radiator:

If antifreeze or antifreeze flows out of the system and is very dirty, has traces of rust and other particles, then it is necessary to flush the cooling system several times, pouring ordinary water into it and draining it back. This procedure must be repeated until the water comes out clean!

Then you can screw the block plug back in:

Also close the radiator tap and you can start pouring new antifreeze into the VAZ 2109-2108 system.

This must be done in a thin stream without sudden movements, so as not to form an air lock. Otherwise, you will have to drive it out later by opening the cap of the expansion tank and, with the “face” raised, heavily revving the engine on a warm engine.

After the new coolant is poured into the system up to the mark in the MAX expander, tighten the tank cap and start the engine. Let it run until the radiator cooling fan comes on. Then you can turn off the engine and, after a long stay, check the fluid level in the tank again. If it drops below the MAX mark, you need to top it up to the required level!

I don’t know why, but even many experienced owners drive their cars for more than 100,000 kilometers and never replace antifreeze or antifreeze during this period (depending on what is filled). In fact, this fluid needs to be changed every 2 years or the car's mileage of 45,000 km, whichever comes first.

If you do not change the coolant in a timely manner, then corrosion may appear in the channels of the block and cylinder head ahead of time and the engine life, of course, will be reduced. This is especially true for the cylinder head. Quite often I had to disassemble engines and look at the cooling channels in the cylinder head eaten by corrosion. After such a picture, you become scared for your car and you will definitely not forget to change the antifreeze on time.

So, below I will provide a more detailed report on the completion of this work, and also provide a list of the necessary tools:

1. Head for 10 and 13
2. Ratchet
3. Phillips screwdriver
4. Keys for 13 and 17 (provided that you have a 2111 engine and will have to remove the ignition module)

I’ve already said it above, but it’s better to repeat it again. If you have a 2110-2112 engine, then the antifreeze drain plug located in the block is free and can be used without any problems. If the engine model is 2111, then an ignition module is installed there, so it will have to be removed first. Here is its location (below the 4th cylinder):

After it is removed and set aside to avoid flooding with antifreeze, you can begin further work. We unscrew the front part of the engine crankcase protection so that you can place a container under the radiator drain hole.

Now we unscrew the cap of the expansion tank, then the plug in the engine block and radiator, of course, you first need to place a container of the required volume under each drain hole.

Here is the plug in the block after unscrewing:

And here on the radiator:

It is worth noting that when draining coolant on a VAZ 2110-2112, the car must be on a flat, flat surface. After all the antifreeze has drained, you can screw the plug into place in the cylinder block and radiator. Next, you can begin replacing the coolant. To avoid an air lock in the cooling system, first disconnect the fluid supply hose to the throttle assembly, which is shown in the photo below:

And when pouring antifreeze into the expansion tank, you need to pour it until it flows out of this disconnected hose. Then we put it on the terminal and tighten the clamp. Next, top up to the required level and tighten the tank cap.

We start the engine and let it warm up until the radiator cooling fan comes on. We wait until the car has completely cooled down (the morning after the replacement) and look at the fluid level in the conservator.

If it is below normal, then you need to add the required amount.

Sources

• https://www.avtorem.info/sovety/tosol-ili-antifriz—delaem-pravilny-vybor.html
• https://remont-vaz2109.ru/zamena-oxlazhdayushhej-zhidkosti-instrukciya/
• https://zarulemvaz.ru/zamena-oxlazhdayushhej-zhidkosti-na-vaz-2110-2112/

Checking the engine cooling system of VAZ 2108, 2109, 21099

We will check the engine cooling system of VAZ 2108, 2109, 21099 and their modifications independently, without the help of specialists and technicians. The reason for checking may be a constant decrease in the coolant level in the expansion tank, or overheating or not warming up the engine, etc.

Checking the engine cooling system of VAZ 2108, 2109, 21099

Checking the coolant level in the expansion tank

It should be 25-30 mm above the MIN mark printed on its side. The engine must be cold when checking. If the level is lower than required, add a little liquid similar to that poured into the cooling system (antifreeze, antifreeze).

MIN and MAX marks on the expansion tank of the cooling system

If the level in the expansion tank constantly drops, we establish the cause of the malfunction. In most cases, the location of the leak can be determined by visual inspection (see paragraphs below). For example, a loose clamp on a hose.

Checking the cooling system for coolant leaks

Checking for coolant leaks should be carried out both on a cold engine and after starting, during warm-up, since the leak may be periodic and temperature-dependent.

Checking the system drain holes in the radiator and cylinder block

We inspect them for coolant leaks. If necessary, pull it out of the plug (on the radiator by hand, on the block with the key set to “13”).

We check the tightness of the coolant temperature sensor and the fan switch sensor

We inspect their installation locations (under the distributor and in the left radiator tank), tighten them if necessary.

Checking the hoses and tubes of the engine cooling system

It is necessary to inspect the places where they fit on the pipes and fittings of the system elements, and the tightness of the clamps. In addition, the integrity of the hoses is checked by inspection and feeling by hand.

Loose clamps can be tightened with a screwdriver or a wrench (but without much zeal, since you can cut through the hose with the clamp). It is advisable to replace all unreliable clamps with proven, good quality ones.

Checking the radiator of the engine cooling system

We carry out a visual inspection of its tanks (they are installed on rubber gaskets, which over time begin to leak coolant) and the pipes on which the hoses are attached. In addition, we pay attention to contamination of the radiator. Heavily contaminated ones will have to be washed, as the engine may overheat.

Checking the expansion tank

There should be no cracks in it, the hoses going to it must be securely fastened and sealed. See “Expansion tank VAZ 2108, 2109, 21099”.

Checking the pump (coolant pump)

A coolant pump malfunction is almost invisible in its early stages. Signs of this may include dampness of the pump body and the front part of the pan. The gasket under the pump body or the oil seal on the axle may not be airtight (if the oil seal fails, coolant begins to ooze through the drainage hole in the bottom of the pump). You can also hear increased noise from the front of the engine when it is running. You can swing the pump axle by hand by its pulley (check the bearing). Strong play indicates wear of its parts.

Checking the heater radiator (“stove”)

Most often, signs of a leaky heater radiator or its tap are the appearance of dampness in the front passenger's feet and the sweetish smell of antifreeze in the cabin.

Checking the coolant supply pipe to the pump

A metal pipe is installed behind the engine and attached to the block. We inspect it for loss of tightness.

In addition to the above, coolant can escape through a “punched” head gasket or a crack in it or in the block. It is impossible to visually detect such a leak. There are only indirect signs here. For example, constant bubbling of coolant in the tank, wet spark plugs, white deposits on the oil filler cap and dipstick, antifreeze in the engine oil.

Checking the thermostat

We start the engine and watch the thermostat warm up. If it is working properly, then first its upper part will warm up (the small circle of the cooling system is working), then the lower part of the thermostat will warm up sharply (the large circle is working and liquid flows through the radiator). All this can be understood by touching the thermostat with your hand. If the real picture of what is happening does not correspond to what is described, the valve in the thermostat is stuck, either in the open or closed position.

The upper part of the thermostat begins to heat up immediately after starting the engine, the lower part only after its thermal valve begins to open.

Checking the operation of the fan on the radiator

We continue warming up the engine at idle, which began in the previous paragraph. After 10-15 minutes, the fan on the radiator should automatically turn on. If this does not happen, check its sensor and electric motor. There are check features for cars of different years of manufacture.

Replacing coolant on VAZ 2108, VAZ 2109, VAZ 21099

Welcome! Coolant - it is needed only for the cooling system and in other systems of the car it is not used anywhere else, thanks to it the engine is cooled during operation and thus the engine takes longer to boil (If the system is working properly, it practically does not boil at all), if the liquid is removed from system, it will work, but it will boil so quickly (in about 5-10 minutes) that you will have to constantly turn off the engine of the car and wait until it cools down at least a little, besides, you will not be able to find out the temperature of the engine without liquid , because the sensor that monitors the temperature usually reads the temperature not of the engine (It’s just that everyone is already accustomed to calling it that, although the temperature of the liquid and the engine may even differ) but of the coolant itself, and how will it determine the temperature if this liquid is not there, therefore For the future, under no circumstances should you drive a car if all the fluid suddenly leaks out, since you won’t drive far and will most likely ruin the car’s engine.

Note! To replace this fluid in a car, you will need: An empty container of at least 10 liters (Although you can take less, it is best to stock up on a 10 liter container to avoid spilling the liquid), as well as wrenches, and a clean rag to use. wipe your hands and if liquid gets on the car engine, wipe it off it; in addition, you may need hex keys and different types of screwdrivers!

When should you change the coolant? If you follow the manufacturer’s advice (we don’t recommend doing as the manufacturer says, but just take a note to yourself), then the fluid needs to be changed in cars of the Samara family every 50,000-75,000 thousand km. mileage, but in real life the liquid may become unusable earlier, factors such as the quality of the liquid are responsible for this (If it is fake, then even 1000 km

enough for it to change its color) and its expiration date (Each coolant has its own expiration date and after its expiration it must be drained and replaced with a new one, otherwise all the additives that are in it stop working and the engine first it will boil faster and secondly, corrosion inside the parts will begin where the liquid leaks, the liquid has an anti-corrosion additive and thus when the shelf life of the liquid expires, then all additives stop working as they should), by the way it will begin when the liquid becomes unusable let's talk, any liquid you probably paid attention to when purchasing has a color (Red, blue, etc.), if after a short period of use the liquid changes its color to reddish (a shade of rust), then the liquid is fake, it must be immediately replaced with a new one, In general, high-quality liquids have a very stable tint and they retain their color for quite a long time and in the end they only darken, so if your liquid immediately changed color after filling and not driving the car for a long time, then you also filled in a fake, which is best replaced with a new one liquid

Note! When you come to a car store (Unlikely, but they can), we recommend that you check the fluid there for its quality, of course you will have to open it to do this, but if you first buy the fluid and later check it with the sellers, then you should not have any problems with the purchased fluid, You can find out in more detail about how you can check a liquid for counterfeit and find out how antifreeze and antifreeze differ from each other in the article: “Useful information about antifreeze and antifreeze on VAZ cars”, everything is described in detail there!

Causes of overheating

The cause of overheating may be a malfunction of one or more elements of the cooling system. Common causes are a lack of coolant in the tank or a faulty thermostat. Many motorists simply forget to check these little things. Often, leaks can be found in the nine, due to which antifreeze or antifreeze constantly decreases. The VAZ 21093 model also suffers from similar phenomena as a result of long-term use.

Particles accumulate in the thermostat, which do not allow the moving element of the device to move; it jams.

1. Replacing the pipes and thermostat solves the problem of overheating. But if overheating occurs for these reasons, then most likely the service life of one or another element has simply expired. Another thing is incorrect operation.
2. The motor is not designed to operate under overload, for example, when towing or idling. In such cases, heating occurs so quickly that the temperature rises intensely above normal. The cooling system resource is insufficient, resulting in the engine overheating.
3. Incorrect adjustment of the injection and ignition system at the factory or after repair leads to disruption of the combustion process of the combustible mixture. The exhaust gases at the outlet are hotter than necessary, as a result of which the temperature of the unit increases. Not only the engine suffers, but also the carburetor.

Too hot gases leaving the combustion chamber cause the exhaust valve to burn out, which also leads to overheating.

Text version

Auto repair

You need to prepare the container in advance, you need to prepare everything, there is such a thing, it’s just like it won’t run once, of course you won’t run?

Even here the cartoon offended us, we don’t get the plug on the expansion valve, unscrew it, I broke it for you, in general, the process has begun, I’m no longer a crap antifreeze. Lost shade after parting this word radiator faucet no one unscrews the faucet product antifreeze cold day.

Replacing antifreeze

He ran, it would also be advisable to close the generator so that this salon doesn’t get caught, you can click it, it will come in handy for anyone small! This is how it turned out, then we move on to washing, so I bought such a product, I don’t know the connection. Each one is located differently, let's look further, find a watering can, cover all the plugs on the radiator with blocks, maybe it's not too tight, you need to tighten it!

They tightened the Dothrak and tightened it, oops on the radiator, too, all the liquid was running, I added an additive to the radiator, confiture, is it a sticky thing? I filled in the additive according to the instructions, the leaking stopped now when I replaced the antifreeze, okay, it’s just a matter of overcoming this additive: Usually we pour warm water if it’s cold outside.

Replacing antifreeze for VAZ 2108

Often she will pass there, you can hear the street, you can open it, or rather unwind it. The pipe that goes to heat the carburetor can be done.

Already all the child is on fire now when the upper scale is standing where it will go. Then we can add more water to the radiator and return the industrial ones to work.

You need 10 minutes to wash and I’ll take the benefits in short? How int glad with the boiling water will go let's go do it it's done cherry radiator this same hour let's let everything washed all clean and pretty. Now we’ll give one more round of water from the radiator.

21099

Screw me with hot water again, let’s fill it with water for five minutes, let’s work and pour it in directly. The antifreeze system is empty, we will fill ourselves with antifreeze, we will not tighten it too much, we have unscrewed it. Heating the carburetor so that everything would surely leak out, the air would not be held in anything by the perry, we top it up, we fill it.

The ambassador tightened the radiator, everything was twisted especially should be enough: In principle, in principle, it’s blue, then my son, if you see that you h1 on the antifreeze barrel has changed color from red to red or blue, too, to red, then that’s it. It's time for me, it loses its properties or we are the last antifreeze, eggplant bushes and almost all the last drops:

Expansion tank plug

This is one of the key elements of the VAZ-2108 engine cooling system; it is installed on the expansion tank and is necessary in order to maintain optimal pressure in it. The fact is that the boiling point of antifreeze or antifreeze is slightly higher than that of plain water. And if this liquid is still under pressure, the temperature rises another few degrees. The design of the plug consists of a body and two valves - one lets air in when the pressure decreases, and the second releases it when the pressure increases excessively. As a result, an optimal pressure value is maintained inside the system.

Level control and required volume

Before changing the working fluid, the car owner should know what the volume of the Nine’s cooling system is and how much refrigerant it will contain in order to buy the required amount of fluid to complete the task. When changing, the plastic reservoir under the hood will hold about 8.7 liters of antifreeze. If the working substance is not completely drained from the system, then approximately 7-7.5 liters will be poured into it. As for the level control, it is carried out according to the expansion tank marks in the engine compartment. Please note that when the car engine is warm, the fluid volume may be higher. Therefore, before checking, the engine must be turned off and allowed to cool.

Ideally, the refrigerant level should be between two marks - MIN and MAX.

Serber24 user Sani4 in his video clearly demonstrated the procedure for changing antifreeze in a VAZ 2109 car.

For what reasons is coolant consumed?

There are several reasons why the volume of refrigerant will decrease in the refrigeration system:

1. Low negative temperatures. In severe frost, the liquid decreases in volume. This reason cannot be called a leak, but car owners in winter often confuse this problem with a fluid leak. During the cold season, experts recommend adding refrigerant to the system.
2. Formation of cracks and damage in the expansion tank or on its cover. As practice shows, if the defect on the container is insignificant, it will not be easy to detect it visually. The crack may resemble a scratch. Detailed diagnostics will be required. To identify the location of the leak, you will have to use a special dye that is added to the liquid.
3. Lack of tightness in the connections of the lines or damage to the pipes. This problem can be clearly identified. In places of malfunctions, wet traces of refrigerant are visible. If the defect is minor, then it will also not be possible to detect it through visual diagnostics. You will have to add dye to the refrigerant.
4. Damage to thermostat or gasket. If there are defects in the device seal, liquid will leak out, and over time its amount in the cooling system will decrease.
5. Damage to the radiator device of the heating system. During operation, the radiator wears out. If it has already reached the end of its service life, refrigerant may leak through cracks formed on it or through the hose connected to it. Adding liquid is not practical; the cooling radiator must be replaced.
6. Presence of defects on the cylinder head gasket. If there is damage, a leak will form. As a result, the antifreeze will begin to mix with the engine oil, which will enter the coolant. Repairing the problem involves replacing the cylinder head gasket.

The coolant addition procedure is performed with the engine cold. In order to add antifreeze, you need to open the hood of the car and unscrew the cap of the expansion tank. The required amount of liquid is added to the reservoir, after which the lid is screwed on.

If it is not known what fluid was used previously, it is better to change it. Because mixing different types of refrigerants will cause the substance to lose its properties.

Antifreeze or antifreeze?

Many drivers argue about what is better to fill in the cooling system of the VAZ-2108. Some people prefer foreign brands of antifreeze in red or green colors, while others try to pour exclusively blue antifreeze. But which is better and which driver is right? In fact, antifreeze is the same antifreeze, only of a domestic type. If we go deeper into the question, then literally “antifreeze” is any liquid that does not freeze. Even “Triple Cologne” can be called antifreeze.

Of course, the red and green liquids that are found on sale contain many more additives; they contribute to the normal operation of the entire system. But antifreeze also consists of a large number of additional substances that counteract the formation of scale and lubricate the pump elements and the insides of radiators. Therefore, to save money, you can safely use antifreeze in your VAZ-2108 car. It has high efficiency and fairly low cost.

Replacing the coolant temperature sensor on a VAZ 2109 (injector)

1. Location
2. Malfunctions
3. Examination
4. Replacement

On any car, including the VAZ 2109, the coolant temperature sensor plays a huge role, since it largely ensures the proper, efficient operation of the engine cooling system.

Location

To repair or replace the coolant temperature sensor, the first thing you need to know is its location.

In VAZ 2109 cars, the DTOZH is located between the thermostat and the cylinder head. The device has two contacts, one of which serves for ECU readings, and the second turns on the fan.

It is also worth noting that near the DTOZH there is a single-contact sensor, which are often confused with each other.

The main function of the DTOZH is to cool the liquid. The colder it is, the richer the air-fuel mixture entering the engine will be.

Location

Malfunctions

There are several main malfunctions that lead to failure of the coolant temperature sensor. Namely:

• There is an electrical contact inside the sensor that may break or become cracked. If the contact is broken, this leads to complete combustion of the regulator. If there are cracks, the sensor can still function, but the lack of proper contact does not allow accurate information about the coolant to be transmitted;
• Sensor insulation is broken. If the wiring insulation is poor, short circuits occur. They, in turn, cause the device to burn out;
• Wires break near the sensor. Because of this, the regulator cannot turn on the fan, which leads to overheating of the car.

In the summer, a failure in the operation of the diesel engine is rarely noticed, but in winter it becomes much more difficult to start the engine.

Signs of breakdown

How can you determine that the coolant temperature sensor has stopped working normally or has completely burned out?

1. The cooling fan turns on randomly even at normal engine temperature. But in fact, the fan should only turn on when the power unit overheats.
2. It's difficult to start the engine when it's hot. The cooling system is responsible for regulating the temperature, but a faulty sensor does not allow obtaining objective data and a signal to start a particular operating mode.
3. Fuel consumption increases noticeably. This is caused by overloading the engine, which has to drive at elevated temperatures. Because of this, fuel consumption is increasing.

Before making final conclusions regarding the breakdown or malfunction of the DTOZH on the VAZ 21099, be sure to carry out verification activities.

Examination

Today, VAZ 2109 car owners use two methods to check the condition of the coolant temperature sensor. Let's say right away that the second one is more reliable, but the first one is easier. Decide for yourself which of the methods presented below to use.

According to the table, check whether the resistance corresponds to that required at a particular temperature of coolant or boiling water.

Fans and sensors

There are only two fans on the VAZ-2108 - on both radiators. Moreover, on carburetor engines, the main radiator fan is turned on using a sensor. Calling it a sensor, of course, would be a stretch, since the device is more like a thermostat, only the bimetallic plate moves not the valve, but the power contact. The element is installed in the side tank of the radiator.

As for the fan on the heater, it is turned on manually. Moreover, in order for the air to be hot, you must first open the tap with the appropriate handle. The fan power circuit uses a switch with 3 operating positions and a resistor block. A resistance is simply connected to the circuit, which allows you to lower the supply voltage. Because of this, the engine speed drops.

As you can see, there is nothing complicated in the design of the system. And all the elements that can be found on G8s are used on other machines, but in a slightly different design.

DIY technology for replacing antifreeze on injection VAZ 2109

The replacement concept involves draining the used compound through special holes and filling the system with new antifreeze. The designers provide two drain holes in the cooling system of VAZ engines:

• on the left side of the main radiator;
• on the front wall of the cylinder block.

Replacing antifreeze on VAZ 2109 engines is not possible without first dismantling the ignition module located on the front surface of the cylinder block:

• remove the negative terminal from the battery;
• disconnect the wires from the spark plugs;
• remove the ignition module power supply block;
• unscrew the bolts securing the module relative to the cylinder block and clutch housing;
• loosen the upper left bolt of the front engine mount;
• remove the module bracket from under the bolt;
• remove the module with wires from the engine compartment.

Replacing coolant: antifreeze or antifreeze on VAZ 2110, 2114, 2115 injector

The procedure for replacing coolant on all injection 8-valve VAZs: 2108, 2109

, 2110, 2111, 2112, 2113, .

GROUP https://vk.com/avto_tochka LIVE.

Draining of used antifreeze is carried out according to the following method:

Description of design

The cooling system is liquid, closed type, with forced circulation. The tightness of the system is ensured by the inlet and outlet valves in the expansion tank plug. The exhaust valve maintains pressure in the system when the engine is hot (due to this, the boiling point of the liquid increases and steam losses are reduced), it opens at a pressure of about 1.1 kgf/cm2. The intake valve opens when the pressure in the system decreases relative to atmospheric pressure by 0.03–0.13 kgf/cm2 (on a cooling engine). The thermal operating conditions of the engine are maintained by a thermostat and an electric radiator fan.

The coolant pump is a vane, centrifugal type, driven from the crankshaft pulley by a camshaft drive timing belt. The pump housing is aluminum. The roller rotates in a double-row bearing with a “lifetime” supply of lubricant. The outer ring of the bearing is locked with a screw. A toothed pulley is pressed onto the front end of the roller, and an impeller is pressed onto the rear end. The distance from the mating surface of the pump cover to the outer end of the pulley should be 52±0.5 mm, and to the outer (facing the block) end of the impeller - 39.8±0.1 mm. A thrust ring made of a graphite-containing composition is pressed to the opposite end of the impeller, under which there is an oil seal. If the pump fails, it is recommended to replace it as an assembly.

The redistribution of liquid flows is controlled by a thermostat with a solid heat-sensitive element. On a cold engine, the thermostat valve closes the pipe leading to the radiator, and the liquid circulates only in a small circle (through the thermostat bypass pipe), bypassing the radiator. On VAZ-2108, -21081, -21083 engines, the small circle includes the heater radiator, intake manifold, carburetor throttle assembly heating unit (on engines with semi-automatic starting - and the liquid chamber of the semi-automatic starting device). On the -2111 engine, fluid is supplied to the heater and the throttle assembly heating unit.

Coolant replacement intervals

Over the years of operation, the coolant loses its physical and chemical properties, including protection against scale and corrosion, expansion properties when cooling and boiling, and provides lubrication of the centrifugal pump.

To avoid these malfunctions, it is necessary to inspect both the fluid and all units, and, if necessary, replace them during seasonal maintenance.

Owners of cars that have experienced fluid boiling need to take special care of the system, since the protective layer of paint on the walls of the cooling jacket is damaged and the engine block is severely corroded. You need to fill it with high-quality antifreeze and rinse it first.

Features of the fan and thermostat VAZ 21093,2109,21099

The electric fan includes an electric motor and a four-blade impeller, the blades of which have a variable angle of inclination and pitch to reduce noise levels. To increase efficiency, the VAZ fan system is equipped with a casing attached to brackets.

The electric fan is mounted on rubber bushings. The fan is triggered by a signal from a sensor installed in the radiator tank. In this case, the contact closure temperature is approximately 99'C, and the fan shutdown temperature is 94'C.

The system thermostat provides priority warming up of the engine and regulates the thermal regime. The optimal coolant temperature is within 90-98'C. The thermostat includes a body and a cover, rolled together with the valve.

What are the dangers of a faulty cylinder head gasket?

If technical fluids are changed regularly, antifreeze is purchased from trusted suppliers and the same type is poured, the reason should be sought elsewhere. In situations where bubbling is clearly observed in the expansion tank while the engine is running, the cause of foaming is most likely a failed cylinder head gasket.

A burnt-out gasket compromises the tightness of the channels of the cooling and lubrication systems. As a result, the oil gets into the antifreeze and provokes foaming, and the liquid affects the motor lubrication in the same way. So an increased oil level, detection of light deposits or traces of antifreeze on the dipstick, and an oil film in the expansion tank will confirm the presence of a problem with the gasket.

In addition, exhaust gases break into the cooling system, which causes the antifreeze to boil. And the coolant that gets into the exhaust of a warm engine makes itself known with a characteristic whitish smoke similar to steam. If such signs are present, there is no longer any need to guess why the antifreeze foamed.

If replacement deadlines are not met, the car owner will face the following problems:

1. Antifreeze will not be able to perform its intended functions. This will result in the car's heating system not working as efficiently at low temperatures. In some cases, the stove does not function at all.
2. Due to the appearance of sediment in the pipes and radiator of the car, the circulation of the working fluid will be disrupted. This will cause excessive heating of the power unit. Prolonged use of a machine with an overheated engine can lead to failure of the unit.

Expansion tank

This is one of the main components of the VAZ-2108 cooling system with an injector. Why is an expansion tank needed in a car? First of all, to maintain an optimal fluid level in the system. The problem is that when heated, any liquid, including antifreeze, expands. Therefore, all expansion tanks have two marks - minimum and maximum levels.

The tank is connected to the highest point of the system. Refilling must be carried out in such a way that the antifreeze level is clearly between the minimum and maximum levels. Therefore, when heating, the level will increase to the maximum level, and when cooling, it will drop to the minimum. Thanks to this, air pockets do not form inside the system, which affect the temperature.

Antifreeze replacement process

The procedure for updating antifreeze in a VAZ 2109 is not particularly complicated. For this reason, the vehicle does not have to be sent to a specialized technical workshop - he himself can change the coolant to the system of his car. For these purposes, the car enthusiast will need:

• Select the correct location to install the vehicle before changing antifreeze. The site must have a completely horizontal surface, without descents or elevations;
• Prepare a set of tools, which includes: Pliers or pliers;
• A capacious (at least 10 liters of volume) container for draining spent technical fluid. For these purposes, a volumetric basin, bucket or canister can be used;
• Wipes for wiping parts from antifreeze residues;
• Set of keys and screwdrivers;
• Thick gloves;

Attention - safety precautions! When working with the VAZ 2109 cooling system and technical coolant, remember that:

• Before changing antifreeze, you must stop the engine and let it cool completely. Otherwise, the coolant, heated to its own boiling point and under high pressure, can burn the car owner’s hands and face;
• Coolant has a high level of toxicity. Therefore, you should never drink it, and if antifreeze gets into your eyes or on the mucous membranes of your nose or mouth, it is recommended to rinse the affected area with boiled water.

To replace the coolant in the VAZ 2109 system, you will need 8.7 liters of fresh coolant. Older “Nines” can hold up to 7.5 liters of technical fluid, but there are models with a capacity of up to 9 liters. Therefore, it is recommended to stock up on 10 liters of fresh antifreeze when changing it in the VAZ 2109 cooling system.

During the process of changing the coolant, problems may arise such as detection of a hidden leak or air entering the system. If a minor leak is detected, you can use sealant for VAZ cars, but in most cases it is recommended to replace the damaged part. When an air lock forms, the engine is run.

The procedure for changing antifreeze on a VAZ 2109 can be divided into 2 stages. Let's talk in more detail about each of them.

Stage one

The first stage is draining the antifreeze from the VAZ 2109 tank, as well as from the cylinder block of the vehicle in question. The step-by-step structure of this procedure is presented below:

• Place a container for drained used antifreeze under the expansion tank of the car;
• Using keys and a screwdriver, unscrew the plugs and release the drain hole;
• Allow the waste liquid to flow steadily into the container. If the coolant does not flow out, the drain is clogged;
• Move the container for drainage under the cylinder block of the VAZ 2109;
• Allow the remaining antifreeze to drain;
• Tighten all drain plugs.

Next, it is recommended to flush the cooling system of the VAZ 2109. It is necessary to flush system parts if:

• The antifreeze used is replaced with an incompatible analogue, since during washing the protective microfilm formed by the previous cooler is washed off;
• The drain is very clogged.

However, system flushing is still recommended early, because during this process, leaks can be easily detected before fresh antifreeze is added. To flush the VAZ 2109 system, you can use both special chemicals and clean distilled water. The liquid is poured into the expansion tank of the VAZ 2109, and the car engine starts for 15 minutes. After this, the spent rinsing substance is drained and the procedure is repeated until the water becomes completely clear.

Stage two

The completion of the procedure for replacing antifreeze on a VAZ 2109 Injector and a standard “Nine” is to fill in fresh coolant. First of all, you need to dilute the coolant concentrate. To do this, you will need a clean container and distilled water. The ratio of liquids depends on the desired boiling point of the antifreeze - the higher it is, the more concentrated the cooling substance should be in relation to water.

Before pouring fresh coolant into the VAZ 2109 system, it is necessary to ensure the tightness of the tank by tightly sealing all drain plugs. The finished mixture is poured into the expansion tank. After this, the engine starts (for 10-15 minutes, the so-called “run”). This is necessary to remove air trapped in the system. After running the engine, be sure to check the level of the coolant; if it has dropped, you need to add the missing amount of antifreeze.

System connections

These elements are made of rubber with reinforcement. With their help, all components are connected to each other. The VAZ-2108 cooling system pipes are secured using clamps. But the design has a number of disadvantages, among which are the following:

1. The thermostat housing is connected to the engine block using a short pipe. This makes the design cheap, but there is a possibility that a leak will occur.
2. The pipes that go from the cooling system to the heater tap are located very close to the exhaust manifold. This affects the condition of the rubber - it quickly becomes unusable due to high temperature. In addition, water and dirt constantly get into these pipes, which only aggravates the situation.

It is worth noting that the quality of the pipes is quite low, so they should be changed at least once every two years. The lifespan of the pipes is approximately the same.

Diagnosing water pump faults

The design of the water pump is quite simple. In most cases, the bearing on which the impeller rotates fails. There are two possible types of failure, varying in severity.

1. The bearing has failed. In this case, the motor begins to “squeal” - make a loud, high-pitched sound. The source of the “squealing” is usually located at the front of the engine near the timing belt. As the rpm increases, the sound frequency increases, and as the rpm decreases, it decreases.
2. The bearing is stuck. This happens after prolonged use of a pump with a worn bearing. The “squealing” suddenly stops, but the engine temperature rises sharply. The pump stops working, and the coolant continues to move slowly through the channels without pressure. This, of course, is not enough to cool the engine. If such a situation arises, you should drive at low speeds and with frequent stops to the nearest car service center.

If the liquid level in the expansion tank is normal, but the coolant is boiling and steam is coming from the air valve, do not rush to open the cap. Firstly, you can get burned by the steam. Secondly, boiling antifreeze can burst out in a stream. You need to wait a certain time for the coolant to cool down and only then unscrew the expansion tank cap.

There is another way to check the pump's performance. To do this, you need to partially pinch the thick hose going from the engine to the radiator with your hand and start the engine at idle speed. If the hose pulsates under your fingers, the pump is in working condition. If there is no pulsation, the impeller does not rotate and the pump is faulty. To avoid injury, such diagnostics should be carried out very carefully, without touching the rotating fan with your hands. You need to compress the hose by 10–20% - this is enough to feel the pulsation of the coolant. You should also not touch the engine with your hands - you can get burned.

Then, after removing the protective plastic casing above the belt, you need to inspect the pump mounting location. Typically, when a bearing fails, characteristic leaks appear on the axis of rotation. Under the influence of vibration, the oil seal is deformed. It may look dry, but it leaves a dirty brown mark on the body. This indicates that coolant leakage occurs at high speeds. When the engine is not running, the fluid does not flow out, and the leak area dries out.

The location of a coolant leak due to a faulty pump is marked in red.

The serviceability of the bearing can be checked by rocking the pump drive pulley by hand. To do this you will have to remove the transmission belt. If the bearing is worn out, then when you rock the gear by hand, a certain amount of play will be noticeable, which should not be there.

Causes of VAZ engine overheating

1. A faulty thermostat can cause the engine to overheat. If on a warm engine the upper pipe is hot and the lower pipe is cold, the thermostat is jammed and the antifreeze flows only in a small circle. Or the thermostat will only turn on a large circle, which will not allow the VAZ engine to warm up to the required operating temperature. In this case, the thermostat should be replaced.
2. Another reason for excessive engine heating may be airing of the cooling system; in this case, the system must be pressed and air removed from all cavities.
3. At high temperatures, the fan does not turn on - there is a problem with the temperature sensor, fan relay or the wiring harness to it.
4. Sometimes the radiator honeycombs become clogged, which sharply reduces the intensity of heat transfer. It is necessary to thoroughly clean the radiator; it must be done carefully to avoid damage to the cells.