Electronic control of the VAZ stove; we understand electronics

I decided to replace the old-style stove with a newer one, which was installed from the factory on cars manufactured after 2003.

Pros:

-Updated design, hence more convenient maintenance. -Stronger air flow. -Judging by the reviews, after installing the new stove, the interior became noticeably warmer when compared with the old version (before 2003).

I didn’t buy the unit new (from a Priora 2008), so I checked everything right away, it needs to be washed, cleaned and, if necessary, replaced with consumables.

3) Additional sizing. I tried on the new filter, saw two gaps and decided to re-glue the seal. Made the strip wider.

Diagram and explanations for it

Below is a diagram of the parts that make up the heater system of a VAZ 2110 car.

Detailed diagram of the VAZ 2110 stove design

It is worth saying that recirculation operates in the “tens” heater system, as the diagram tells us. In simple words: air circulates inside the VAZ 2110, and is not taken from the street. The main advantage is that dust and unpleasant odors do not enter the cabin from the street. There are more disadvantages to such a stove system - the glass quickly fogs up. It is recommended to open windows more often if the outside temperature allows it. Air stagnation negatively affects the health of the driver and his companions. The heater gear motor can rarely be repaired, so it should be replaced immediately.

The diagram shows how automatic heating control occurs

For VAZ 2110 owners who want to modify the heater system or carry out electrical repairs, an automatic control circuit will be useful.

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Diagnostics of serviceability and dismantling of the stove control unit

The SAUO module is located on the center console of the car and is responsible for proper heating of the interior. Repairing the VAZ-2110 stove control unit requires certain knowledge of electronics, therefore, before you begin repairing the part, you need to determine whether the problem is really in the electronic module itself.

To do this, it is necessary to initially disassemble the unit and install a deliberately repaired part in its place. Take the SAUO unit to a friend or service center to diagnose your car's heating system.

Before performing any electronic or wiring work on your vehicle, disconnect power from the battery to prevent short circuits or burns to electronic components.

Then you can proceed directly to disassembling the cabinet, through which the functionality of the stove is coordinated. To do this, initially disassemble the buttons on the sides of the stove. The heater controls must be moved to the zero position. Only after this the module can be removed. This must be done very carefully as the power plugs are connected to the back of the device. Once you see them, you should carefully unplug them to avoid damaging the contacts. At this point, dismantling can be considered complete.

The working unit is installed on the standard seat and the operation of the vehicle heating system is checked. If the stove works correctly with the new group, then the fault is in the ACS group itself. Otherwise, it is necessary to diagnose other elements of the heating system.

The main reasons for poor operation of an electric furnace

VAZ 2110 stove diagram

Before you can directly begin to find a solution to a problem, you need to be able to identify it quickly and effectively. First, it is advisable to consider the general structure of the furnace. So, the heater furnace consists of the following components:

• mounting block fuse;
• incendiary lock;
• ignition switch together with its unloading relay;
• a special switch that regulates the operating mode of the furnace electric motor;
• additionally built-in resistor;
• stove motor;
• heated rear window of the car, which contains a heater adjustment button with a light indicator;
• a special functional element for heating glass.

VAZ 2110 stove wiring diagram

One of the reasons for the malfunction of the electronic circuit of the furnace may be the lack of functional activity of the heater electric motor at both low and high speeds. In this situation, you must proceed as follows:

• First you should make sure that the fuse has not accidentally blown;
• If a blown fuse is detected, it will urgently need to be replaced with a new one.

Note. Before proceeding directly to replacing the old fuse with a new one, it is necessary to first and without fail establish the cause of the burnout. If this is not done, the service life of the new fuse will most likely be short.

• There may also be a break or damage to the wiring at the point of its connection;
• to eliminate the above reason, it is necessary to check the electrical circuit according to the furnace diagram;
• after which, it is necessary to eliminate the impulse, if it took place;
• if the heating switch does not function, then the most likely cause is a stuck pusher or burnt contacts;
• to accurately diagnose a switch malfunction, you need to check the voltage level at the side terminals while changing the position of the switch in space (to do this, it is enough to apply current to the main terminal);
• if during diagnostics a change in voltage is not detected when changing the position of the switch knob, then it must be urgently replaced;
• there are a huge number of possible reasons for the electric motor to fail to operate: broken electrical connections or armature winding, immobilized cleaning brush, oxidation and/or contamination of the armature commutator;

VAZ 2110 heater radiator diagram

• It’s not difficult to revive the movements of the brush again; just disassemble it and then clean it;
• restoring the wires will also not be difficult, because the main thing is to find the location of the defect;
• if several of the above provisions do not produce results, then there is only one way out - a complete replacement of the heater electric motor;

VAZ 2110 stove electrical diagram

• sometimes, which is extremely rare, the cause of the malfunction may be the mounting block;
• There are many reasons for the faulty state of the mounting block, but the main ones are: at the soldering site, a complete or partial break in the electrical circuit, fire of current-carrying paths;
• The circuit should be checked according to the furnace diagram, otherwise it will simply be impossible to detect breaks and faults;
• the final practically probable cause may be an internal break in the circuit of the auxiliary (additional) resistor (see How to replace the heater resistor on a VAZ 2110);

VAZ 2110 stove wiring diagram

To eliminate a malfunction associated with the operation of the resistor, it is necessary to check its circuits.

A decrease in armature rotation in the electric motor is one of the reasons for the malfunction in the general circuit of the furnace. In this case, it is necessary to be able to find and eliminate micro-causes, and in particular:

• in case of clogging or oxidation of the collector system armature, the number of rotations of the electric motor will also be reduced;
• to eliminate the above problem, you will need to perform a general cleaning of the collector system;
• sometimes a short circuit may occur in the area between the turns of the armature winding, and to eliminate this cause, it is necessary to check the amount of incoming current;
• everything is very simple, if there is a short circuit of the turns, then the input current will exceed 4.5A;

Note. It is necessary to measure the incoming current only after a preliminary check of the objectivity of the ammeter readings.

Device

First of all, you should know the very structure of the heating system in order to clearly understand what and how to repair, because for the VAZ 2110, interruptions in the operation of the heater are a typical phenomenon, and from time to time requiring the intervention of reliable hands - be it a driver or a service station worker.

For stable and high-quality driving in a car, it is recommended not only to be able to use the heating system, but also to understand the heater’s structure. The operating principle of the system can be found here: https://vazweb.ru/desyatka/otoplenie/otopitel.html

So, the heating system consists of: 1. The actual heater unit, which provides heating for the interior. It is represented (by importance of details):

• An electric motor on which a fan is also attached to pump hot air;
• A radiator, without which the entire system does not work. Moreover, unlike the old heater, the radiator of the VAZ 2110 stove of the new model does not have a tap that shuts off the flow of antifreeze (antifreeze) through the radiator. Thus, it is always (whether in winter or in summer) heated. This was done supposedly in order to eliminate leaks that were often observed through this tap, and also to heat the interior as quickly as possible when necessary. In the summer, the supply ventilation goes past the radiator, but still some VAZ 2110 owners, when repairing the stove, add this tap to the system;
• There are three dampers. One is responsible for air intake recirculation, the second opens/closes the heater duct, the third, the most important for the interior, controls the heater;
• A resistor that regulates the blowing speed.

Repair

As we have already noted, the design of stoves on dozens with carburetor and injection engines has practically no differences. Therefore, the repair instructions below are suitable for owners of a VAZ 2110 with both types of power units.

If you are planning to overhaul your old-style stove, we recommend starting with the purchase of a radiator. Use copper as it is more efficient and helps the heater work better.

To carry out repairs correctly, strictly follow the points presented in our instructions and rely on video materials.

There is a plug on the engine block through which coolant is drained into any container. If you plan to use the same antifreeze or antifreeze again, choose clean containers. Next you need to move the frill forward. This process will take quite a long time, so be patient. Next, you need to remove the windshield wipers and get rid of as much as possible of everything that could interfere with the repair process. Remove your stove body

It is divided into two parts, which is important to know in advance. The front part of the stove body is removed directly along with the fan. After this, the stage of dismantling the cabin filter begins.

Check its current status. If the filter is dirty, this is an excellent reason to replace it. The next stage involves removing the second part of the housing. Loosen the clamps used on the hoses a little. This will allow you to easily remove the hoses. Having applied some effort, you can now finally remove the radiator from its seat.

Reassembly

In fact, reassembling the unit only involves following the opposite sequence of operations. By disassembling the stove, you have the opportunity to simultaneously inspect other elements of your car to make sure they are working.

Get used to the fact that during complex repairs you need to check components along the way that are not related to the current problem you are solving. Even if the part is suitable for use, but has already worn out enough, it is easier to change it now than to carry out heavy dismantling work again in a couple of months.

The only nuance that you should pay attention to when reassembling is the type of stove

If you have an old-style heater, in this case it is important to pay attention to a couple of issues

1. When the plastic housing is mounted in place, make sure that the pedal fits neatly into the groove intended for it.
2. Check how tightly all the nodes fit into their seats. Otherwise, unpleasant consequences may arise that will force you to dismantle the entire assembly again. And this, as you already understand, is not an easy process.

That's it, now all that remains is to return the coolant back into the system and tighten the plug securely. Test your vehicle in a garage before driving it on public roads.

If third speed does not work

If the third fan speed is the last (as in older models), then it is connected without resistance. Malfunctions may lie in the contacts of the automatic control system. Below we will talk about this in more detail.

Replacing self-propelled guns

Control units cannot be repaired - they are simply replaced with new ones. But first you need to make sure that the reason is in this mechanism. Instead of the route, a working control unit is installed. Its price is about 1500 rubles. Removing the element is very simple - just remove the buttons installed next to it.

And then the device can be removed. The handles are set to the zero position and then removed. Then the glass and front cover are torn off. Before removing the heater control unit on the VAZ-2110, unscrew two screws in the front and one in the back. The card can then be removed from the case and carefully inspected to ensure its integrity.

If there is any damage to the board slats, they will need to be repaired. Subsequent editing is done in reverse order. If the control unit does not regulate temperature, the entire board must be inspected. There will definitely be shortcomings. But before you remove the heater control unit on the VAZ-2110, you need to check the fuse box.

Setting the air temperature from the heater

You can set the desired temperature in the cabin using the adjustment knob. But for a more accurate result and adjustment, there is a special screw in the block. To check the accuracy of temperature control, close all doors and windows. Place a reference thermometer in the sensor area.

Then the element is switched to automatic mode and heating is controlled by a thermometer. How long can the control unit of the SAUO VAZ-21102 stove be adjusted over time? The procedure takes no more than half an hour. If after 15 minutes the actual temperature values ​​do not correspond to the set values, the device is removed.

Turn the adjusting screw clockwise. If you turn the screw clockwise, the temperature will increase; if not, it will decrease. Then the element is installed in place and its serviceability is checked.

As for the possibility of troubleshooting, the control unit of the VAZ-2110 stove of the new model cannot be repaired (however, like the old one). In case of serious malfunctions, it is completely changed. In addition, the cost is low.

Differences in design

The VAZ 2110 was equipped with stoves of the so-called new or old model. Both systems, including those on the VAZ, which have an injector instead of a carburetor, are not particularly structurally different.

So, the differences are direct:

1. The main difference between the new model and the old stove is the design of the heater radiator. Therefore, if you are repairing a heating system and decide to install a new model instead of an old radiator, then take into account some nuances;
2. Moreover, even the controller from SAUO is not quite the same. 4- or 5-position regulators produced before the fall of 2003 have already been discontinued and are not suitable for new heater models;
3. Micro gearboxes are also different from the September 2003 issue. They have different resistors (shaft position sensors), so you need to check if the resistor is interchangeable in the MMR model you purchased.

Repair

If you're thinking about furnace repair, especially if you have an older system, start by purchasing a new furnace radiator (buy a copper one, it heats up much better) and this will only improve the furnace's performance.

But the design of the stove on the VAZ injector is practically no different from carburetor cars.

The following is an analysis of the following points:

1. There is a plug in the engine block from which antifreeze is drained into a kind of container;
2. Pull the ruffle forward a little (the operation continues), remove the wipers and everything that gets in the way;
3. The heater housing has been removed. You should know that the body is divided into two parts. The facade is removed along with the fan;
4. Next comes the cabin filter housing. It can be changed at the same time;
5. The other part of the fan housing is removed;
6. Clamps are loosened, pipes are removed;
7. Then, with some effort, the radiator is removed.

Assembly, as they say, is in reverse order. Another nuance - if you have an outdated stove, pay attention to two points:

• When installing the plastic housing, make sure that the pedal fits into the desired groove;
• Knowing the structure of all components, be sure to double check their tightness.

Stove design

This unit includes several devices. The radiator is the main element of the stove - it heats the air entering the cabin. It is located under the hood. The next component is the air distributor, equipped with special pipes that run through the cabin of the 2110.

Removing a faulty radiator, you can get to it through the hood

To control the operation of the heater, an SUAO unit is installed in the VAZ 2110 car, which is called a controller in the technical operating manual. The unit works in conjunction with a temperature sensor in the cabin; it is also called a ceiling sensor. The sensor reports the temperature to the unit, then this indicator is compared with the set temperature on the handle. If the indicators differ by more than 2°, warm or cooled air is supplied to the VAZ 2110 interior.

It’s worth taking a closer look at the handle, or more precisely at its extreme positions – MAX and MIN. If the heater knob is set to one of these indicators, heat is supplied without the operation of the temperature sensor in the cabin. The scheme includes all of the above elements.

The device of the “tens” heater includes another unit - a gearmotor, which is responsible for opening and closing the damper. The miniature electric motor performs an important task in the operation of the heating system, as evidenced by the diagram. If the gearmotor is faulty, the system will only produce cold or hot air. If the gearmotor fails when the damper is closed, the system will stop functioning. We have described the main components of the VAZ 2110 heater; the diagram contains a more detailed list.

• Radiator.
• Air distributor.
• SUAO block.
• Ceiling sensor.
• Lever.
• Damper.
• Gearmotor.

Radiator

In the heating system, a radiator is installed for heating, which enters the VAZ 2110. It is also called a heat exchanger. Heating is carried out by the heat of the antifreeze. This component is connected to the engine cooling system by pipes and hoses. Antifreeze constantly circulates through the heat exchanger of the stove. The damper, based on the commands of the unit, directs the incoming air to the radiator or directly into the passenger compartment. If the heater damper is in an intermediate position, then one part passes through the heat exchanger, and the second bypasses the radiator. If we compare this part of the stove with previous generations of the VAZ, it has a number of useful improvements, as the diagram demonstrates.

SUAO and ceiling sensor

The process of removing the interior temperature sensor
These components of the VAZ 2110 heater are connected and work according to the following principle:

1. The sensor determines the temperature inside the car;
2. This data is sent to the SUAO block;
3. The block compares the temperature with the position set on the handle of the VAZ 2110 stove;
4. After comparison, the position of the damper changes or remains the same - it depends on the indicator;
5. This way the temperature in the cabin is controlled;
6. If the heater handle is set to MAX or MIN, then the data from the ceiling sensor is not taken into account.

All these actions are demonstrated by the diagram. The block is a set of microcircuits; the normal operation of the stove depends on its serviceability. Both the sensor and the control system can be replaced.

Damper and gearmotor

The heater gear motor changes the position of the damper, due to which air is supplied to the cabin. This component is controlled by the control system block. If the device is faulty, the damper will not move. The unit is a miniature electric motor. When it breaks, it is usually replaced, since repairing it will be problematic. This also applies to the damper. The diagram shows the connections between the gearbox and the block.

Heating device design

The heating of the VAZ-2110, through which a motorist can feel comfortable in his movable property at any time of the year, consists of several separate devices working in close conjunction. The central device of the unit is the radiator, with the help of which the air flows going into the cabin are heated. In order to be able to repair or replace the radiator, you will have to look for ways to it under the hood.

The second most important device is the air distributor, which has several pipes running throughout the cabin of the “tens”. Compared to the old-style models that preceded the release of the VAZ-2110, the new car has an evaporator, which has found a place in the air conditioning system.

The operation of the stove is controlled through a special control unit. In the VAZ-2110 operating manual, this device has a different name (controller). The unit operates together with a temperature sensor located in the cabin. The sensor transmits information regarding temperature to the unit, after which the data is compared (the information displayed on the handle is taken into account). As soon as the system detects a temperature difference of 2°, warm or cooled air immediately begins to flow into the cabin.

To understand how the heater works, you need to pay attention to the handle of the device; two extreme positions deserve special attention - MAX and MIN. The fact is that when the handle is set to one of these indicators, the system begins to supply heat, not taking into account the data from the temperature sensor.

The VAZ-2110 stove provides for the presence of such a device as a gearmotor. The task of this device is to open and close the damper. A small-sized electric motor is extremely important in the operation of the heater. Even with a minor breakdown of the gearmotor, the system will be able to provide the car owner with only cold or only hot air. If this device breaks while the damper is closed, then the entire system will cease to perform its function. The main components of the heating device:

• radiator;
• a device that distributes air flows;
• SUAO block;
• ceiling sensor;
• lever;
• flap;
• gearmotor.

Purpose of the radiator

The VAZ-2110 stove of the new model has a radiator, through which the air flowing into the vehicle is heated. Quite often on the global network you can find diagrams in which the radiator is designated as a heat exchanger. The heating process in the device occurs due to the supply of warm antifreeze. The radiator is connected to the cooling system of the power unit through several pipes and hoses. Coolant circulates inside the heat exchanger all the time. The volume of incoming air and its direction depend on the location of the damper. When the heater damper is in an intermediate position, part of the air flows through the heat exchanger, and the remaining volume bypasses the radiator. In the diagram you can see that the radiator of the new model differs from other models in several useful modifications.

Operating principle of the control system and ceiling sensor

The operating principle of the VAZ-2110 stove can be understood by studying components such as the control system and the ceiling sensor.

The function of the ceiling sensor is to determine the temperature inside the vehicle. Then all the information will go to the SUAO block, where the incoming value will be equal to the temperature that is reflected on the handle of the VAZ-2110 heating device. As a result of the verification, the position of the damper will be changed or remain the same. Everything will depend on the difference between the values ​​being compared. Through this simple manipulation, the temperature inside the car is controlled.

When setting the device to any of the extreme values, the information from the ceiling sensor will not be taken into account. The SUAO block is a set of microcircuits on which the functioning of the heater directly depends. If malfunctions occur, both the sensor and the control system can be replaced without much labor.

The device of the damper and gear motor

Due to the gearmotor, the position of the damper that regulates the air supply changes. This component of the system is controlled by the control system block. If a functioning device fails, the damper stops moving. The device itself looks like a small electric motor. Most often, a broken device must be completely replaced, since repairs are quite problematic. The same principle applies to the operation of the damper.

Design Features

For the VAZ 2110, it is possible to install two types of stoves - new and old. Regardless of the engine used (injection or carburetor), there are no fundamental differences in the designs of the stoves.

But what is the difference between the new and old type stoves? Let's try to figure it out.

• Radiator design. This is the main difference between the devices. Therefore, when replacing a radiator from an old one to a new one, be sure to take into account the installation nuances;
• The controller knob on stoves is slightly different. Old-style heaters have a main problem - they have been discontinued. They cannot be an analogue for 4 and 5 position controllers, which began to be equipped with dozens of them in the fall of 2003;
• The micro-gear motors for the stoves are different, starting in September of the same 2003. The difference lies in the shaft position sensors (resistors). Therefore, when making repairs, make sure that the devices are truly interchangeable and that you bought old-style resistors for your old stove, not new ones. Otherwise the gearmotor will not work.

Design of the heating system VAZ 2110

1 - air ducts through which the rear part of the car is blown 2 - tunnel to the casing 3 - air ducts through which air goes to this 4 - legs the nozzle warms up the center of the car. 5 – side heating 6 – heating of the side front windows 7 – heating control system 8 – air distribution housing 9 – flap for blowing the footwell 10 – flap for blowing the windshield

The VAZ 2110 stove does not work, diagnostics and repairs

Having decided on the main reasons, it is necessary to begin diagnostics. First of all, problems with temperature regulation may be associated with a breakdown of the control unit or damper.

First, you should check the temperature sensor on the ceiling, which is located near the interior lamp. Simply put, malfunctions in its operation lead to the fact that the required command does not reach the damper and the stove does not heat.

Checking the sensor is easy. To do this, you need to move the control knob first to one extreme position, and then to the other. At the same time, you should check whether there is a change in the temperature of the incoming air.

The temperature may not change completely, or the air becomes warmer only when the handle is in the extreme maximum position. If the temperature does not change, then the problem is not in the sensor. In the second case, the culprit may well be the controller, which is replaced with a working device.

A breakdown of the gear motor often results in the heater blowing cold air into the cabin after turning on the heating. This is a common problem. As a rule, replacing the heater gear motor allows you to normalize the operation of the system.

To change this element, you need to remove the windshield wipers, dismantle the frill by unscrewing the screws. Then you need to disconnect the wiring from the gearmotor, remove the faulty device and install a working one.

If there is a suspicion that the heater of the VAZ 2110 stove has failed, you will need to remove the main deflector for inspection. To do this, you need to straighten the fasteners and move the damper. By the way, you can get to the damper from the engine compartment.

The inspection allows you to determine whether there is a need to replace the radiator. If this is the case, you need to disassemble the stove. You can read below about how to remove the radiator of a VAZ 2110 stove with your own hands.

If the air is warm, but not warmed up enough or supplied poorly, it is recommended to change the damper. Instead of a standard plastic solution, it is better to buy an aluminum heater damper from a VAZ.

This eliminates possible deformation of the damper during switching, as well as improves heat retention. As a result, the heating system works more efficiently, the air is supplied hotter, which allows you to warm up the interior more efficiently and quickly.

Repair and restoration of the stove damper

The deformed heater damper of the VAZ-2110 cannot be repaired; it only needs to be replaced. In this case, it is better to purchase a replacement metal part that is not so susceptible to temperature effects.

Whatever heater is installed on the VAZ-2110, to carry out repair work, the heater must be completely disassembled. In this case, the process of dismantling and disassembling depends on the design of the stove.

A positive aspect of the heater design on the VAZ - 2101 is its location - to get to it and the dampers you can from the engine compartment and you don’t have to remove the front panel.

Disassembling an old-style stove

For example, let's look at how to disassemble an old-style heater:

1. Remove the terminal from the battery.
2. We remove the windshield wipers, the seal, remove the air intake near the windshield (“jabot”) from the car, in the process you will need to disconnect the windshield washer nozzle tubes.
3. We dismantle the insulation that separates the stove body from the engine compartment.
4. We remove the gear motor.
5. We divide the housing of the stove and air filter into two halves. To do this, unscrew the coupling bolts around the perimeter of the housings and remove the mounting brackets.
6. Disconnect the fan power wires.
7. Remove the outer half of the air filter and heater housing (along with the fan).
8. We dismantle the inner part of the fan housing.

After this you will have access to the dampers. If you are only planning to repair or replace the heater dampers, there is no need to drain the antifreeze, since the heater radiator will remain in place and will not be removed.

Before removing the dampers, carefully inspect and remember their position and the way they are engaged. Further actions depend on the nature of the damage. Deformed damper parts cannot be repaired and only need to be replaced. As for damaged rods and levers, try to repair them or simply replace them. The damaged seal is replaced.

When assembling the stove, pay special attention to the engagement of the dampers. Do it as it was before disassembly, otherwise the dampers will not work correctly, which will affect the performance of the heater.

Disassembly and repair of a new type heater

The new model stoves are disassembled differently:

• disconnect the battery terminal, drain the antifreeze;
• dismantle the frill and insulation;
• disconnect the power wires of the fan and micromotor gearbox;
• unscrew the fasteners that secure the stove body to the body;
• disconnect the coolant supply pipes to the heater radiator;
• We remove the heater from the car along with the filter housing.

After this, we disassemble the stove body, dividing it into two halves, after first disconnecting the air filter housing and removing the mounting brackets. Next, we change or repair the damper, assemble the heater and install it on the car.

Note that the general algorithms of work are indicated above, but in reality, dismantling the stove is not so easy, since many fasteners are located in hard-to-reach places, sometimes you have to disconnect or remove elements that make it difficult or interfering with the removal of the unit.

Video: Why the VAZ 2110 stove does not heat up. Modification of the damper.

• 1 The main reasons for poor operation of an electric furnace

• 1.1 What does extraneous noise in the heater motors indicate and what is its role in the overall scheme

VAZ 2110 heater diagram

As you know, the main functional purpose of a car heater is to supply warm or cold air inside the cabin. In order to have a practical opportunity not only to identify a malfunction, but also to eliminate it, you need to know how the VAZ 2110 stove circuit is designed. After all, there are different types of possible malfunctions and there can be both problems in the electrical circuit and in one of the elements of the stove itself. For a VAZ 2110, the heater diagram and knowledge of it will make it easier for the motorist to find a break and repair the heater.

Checking the automatic control system

Diagram of the automatic heater control system

: 1 – fan electric motor; 2 – additional resistor; 3 – controller; 4 – mounting block; 5 – ignition switch; 6 – cabin air temperature sensor; 7 – recirculation switch; 8 – recirculation valve; 9 – micromotor gearbox for heater damper drive; A – to the instrument lighting switch; B – to power supplies

SAUO pinout

:

The SAUO receives information from:

• – cabin air temperature sensor (6), which has a built-in small fan.
• – MMR (micromotor reducer) (9), information about the position of the heater damper.

Damper control

: Based on the received information and the set air temperature, the controller controls the position of the heater damper, sending appropriate signals to the damper drive micromotor.

Fan speed control

: to obtain a low rotation speed (all but the last), an additional resistor (2) is used, which has two spirals with resistance (0.23 and 0.82 Ohms). When both spirals are connected to the power supply circuit of the electric motor, the 1st fan rotation speed is ensured; if a spiral with a resistance of 0.23 Ohm is turned on, the 2nd speed is provided. When the electric motor is turned on without a resistor, the fan rotor rotates at the maximum 3rd speed (4100 min-1).

If the fan operating mode switch handle is in position A, then the controller also controls the fan speed depending on the difference in the air temperature in the cabin and the temperature set point.

Electronic control of the VAZ stove: understanding the electronics

The VAZ-2110, 2111 and 2112 are equipped with an automatic heater control system (ACS), which in turn creates a temperature in the car set by the driver. A kind of air conditioner without air conditioning, a winter option. The brain of the system is controller 3 according to the 13.3854 type circuit with two control knobs. With the left knob we adjust the temperature in the cabin (from 16 to 30 ° C), with the right knob we adjust the fan: 0 - off; I - average speed; II - low speed; A - automatically. So, here is a breakdown of the VAZ-2110 heater circuit

1. fan motor;
2. additional resistance;
3. controller;
4. mounting block;
5. ignition switch;
6. internal temperature sensor;
7. recirculation switch;
8. recirculation valve;
9. micromotor control of the heater damper;

A - to the instrument lighting switch;

B - to power supplies

If the heater motor stops working, check fuse F18 in the mounting block

SAUO controllers (automatic heater control system). On the left - with automatic mode - primitive climate (tied to the temperature sensor under the ceiling). On the right is the more common 4-speed. Once connected, they are compatible with the standard wiring of the VAZ 2110, with the exception of heating the MMR sensor (enough to start it).

Removing and disassembling the heater on a car with a VAZ-21124 engine

We do not disconnect the steam exhaust hose from the heater radiator, since its fastening clamp is difficult to access. It is easier to disconnect this hose from the expansion tank pipe (see Removing the expansion tank) and remove the heater housing along with the hose.

1. Unscrew the nut of the upper fastening of the heat shield of the steering rack cover.

When dismantling the heater electric motor assembled with the impeller, remove the cover of the air purification filter entering the interior ventilation and heating system.

You can also dismantle the heater motor in a car, but to do this you will have to perform all the operations necessary to remove the heater housing assembly. You can only not remove the body from the engine compartment, but only pull it out to a sufficient distance.

1. We take out the screws...

1. To remove the heater core...

1. We take out the screws and remove the lock washers located under them.

The heater components are not subject to further disassembly. If they fail, it is better to replace them with new ones. There is no point in separating the body parts, since they usually do not fail until the end of the vehicle's service life.

We install the removed components and parts in the reverse order.

When installing the heater housing assembly on a vehicle, you should be prepared for the fact that the heater housing is difficult to fit into place. The installation of the housing should begin from the middle of the engine shield, directing the right (along the direction of the car) part of the housing, first towards the starboard side and down, and then up. It is better to carry out the installation with an assistant.

Installation of the heating and ventilation system for the interior of VAZ 2110, VAZ 2111, VAZ 2112, Lada Ten

Heater Air Ducts and Control Parts

1 – rear heating air ducts 2 – floor tunnel lining 3 – foot heating ducts 4 – central cabin ventilation nozzles 5 – side cabin ventilation nozzles 6 – front door window heating nozzles 7 – interior heating system control lever 8 – air distributor housing 9 – damper foot heating 10 – windshield heating flap 11 – heater

Heater parts
1 – electro-pneumatic valve 2 – front heater air intake housing 3 – air intake water deflector 4 – recirculation damper control valve 5 – air intake recirculation damper 6 – rear heater air intake housing 7 – heater duct damper 8 – heater control damper 9 – radiator 10 – casing heater radiator 11 – steam exhaust hose fitting 12 – supply hose fitting 13 – exhaust hose fitting 14 – heater electric motor with fan 15 – electric motor housing 16 – support platform for the heater control damper drive lever 17 – heater control damper drive lever 18 – micromotor gearbox for the damper drive 19 – resistor 20 – heater casing cover

Interior ventilation of the VAZ 2110 is supply and exhaust: air is supplied into the cabin through holes in the windshield trim (spontaneously - when the car is moving, or forced - when the heater fan is operating) and exits through the cracks between the upholstery and the inner door panels and then through the holes in the ends doors. These holes have valves that allow air to come out, but prevent it from getting inside the car. This design improves the thermal insulation of the cabin.

The air entering the cabin is heated, if necessary, by passing through the VAZ 2110 heater radiator, and is distributed in accordance with the position of the air flow control handle. The main part of the air is directed to the windshield and - through deflectors blocked by flaps - to the side windows and to the central part of the cabin. Air is also supplied to the feet of the driver and the passenger sitting in front through two pairs of deflectors (one pair at knee level, the other at the floor) and to the feet of rear passengers through the lining on the floor tunnel and two air ducts under the front seats.

To speed up the heating of the cabin and prevent the entry of outside air into the cabin (when crossing gas-filled, smoky, dusty sections of the road), an air recirculation system is used. When the recirculation button is pressed down (on the instrument panel), the electro-pneumatic valve opens, and under the influence of vacuum in the intake manifold, the recirculation system flap blocks the access of outside air to the car interior. Thus, the recirculation system can only operate when the engine is running. At the same time, if the fan is turned on, the air in the VAZ 2112 cabin continues to circulate, passing through the heater air ducts.

The fan has three operating modes: low speed, medium and automatic speed selection (determined by the control unit). The fan electric motor is a commutator, DC, with excitation from permanent magnets. The current consumption at maximum speed is 14 A. Depending on the selected speed, the VAZ 2112 electric motor is connected to the vehicle’s on-board network directly (maximum speed) or through an additional resistor. The latter has two spirals with a resistance of 0.23 Ohm and 0.82 Ohm. If both spirals are included in the circuit, the fan rotates at low speed, if only one (0.23 Ohm) rotates at medium speed.

The VAZ 2110 stove does not heat well - reasons

So, if the stove blows cold air on a VAZ 2110, the reasons may be different. In practice, the problem most often appears when the car has been standing for a long time. At the same time, you need to know that, in a simplified way, the VAZ-2110 heater consists of:

• stove radiator;
• air distribution systems;

The VAZ 2110 heater radiator is located in the engine compartment of the car. In fact, this solution “cooks” the warm air before it is supplied to the cabin. The distribution system controls the intensity of air supply, temperature, etc. The supply and distribution system is located in the cabin, installed on the instrument panel.

As for malfunctions, the stove may not heat up if the stove radiator is not sealed or an antifreeze leak appears. In practice, the stove in the car often does not blow warm air if it is not possible to change the temperature regime. The gear motor may also fail or the damper may be faulty.

Even on the VAZ 2110, malfunctions occur in the operation of the automatic control system. This is the block that controls the heater. The list of common malfunctions is completed by a temperature sensor located in the ceiling lining in the car's interior. Now let's figure it out.

Modernization of the damper on the VAZ-2110

Malfunctions with the damper often result in the interior heating very poorly and slowly. The error is the VAZ-2110 heater control unit. The controller is not working properly. The device does not issue a command to extend the flap. In this case, it is recommended to check the temperature sensor. The controller handle is set to its extreme position and then unscrewed several times from left to right. The air flow temperature must be adjusted manually. In this way, the operating condition of the sensor is checked in one of the extreme positions of the handle. If the air flow changes the temperature in the extreme position of the knob, the sensor must be replaced. If warming does not change, the cause must be looked elsewhere.

Electrical circuit of ECM VAZ-21101

1 — VAZ-21101 controller; 2 — block of the ignition system harness to the ABS cabin group harness; 3 — diagnostic block; 4 — immobilizer warning sensor; 5 — immobilizer control unit; 6 — ignition coil; 7 — spark plugs; 8 — nozzles; 9 — electric fuel pump; 10 — block of the ignition system harness to the fuel level sensor harness; 11 — block of the fuel level sensor harness to the ignition system harness; 12 — block of the ignition system harness to the injector harness; 13 — injector harness block to the ignition system harness; 14 — speed sensor; 15 — idle speed regulator; 16 — throttle position sensor; 17 — coolant temperature sensor; 18 — mass air flow sensor; 19 — oil pressure warning lamp sensor; 20 - phase sensor; 21 — oxygen sensor; 22 — crankshaft position sensor; 23 — knock sensor; 24 — solenoid valve for purge of the adsorber; 26 — coolant temperature indicator sensor; 27 — block of the ignition system harness to the instrument panel harness; 28 — block of the instrument panel harness to the ignition system harness; 29 — controller power supply fuse; 30 - ignition relay; 31 - ignition relay fuse; 32 — fuse for the electric fuel pump power supply circuit; 33 — electric fuel pump relay; 34 — electric fan relay; 35 — ignition system harness block to the air conditioner connector; 36 — block of the ignition system harness to the side door harness. 37 — electric fan of the cooling system; 38 — diagnostic connector; 39 — ignition switch; 40 — instrument cluster; 41 — on-board control system unit; 42 — starter relay; 43 — contacts of the 8-terminal blocks of the instrument panel harness and the front harness; 44 — contacts of the 21-terminal blocks of the instrument panel harness and the rear harness; 45 - trip computer.

• A - to the “plus” terminal of the battery;
• B1 — grounding point of the fuel level sensor harness;
• B2, B3 — grounding points of the ignition system harness;
• C - to the starter;
• D - to the driver's door interior lamp switch.

Electrical circuit of ECM VAZ-21104

1 — block of the ignition coil wiring harness to the ignition system harness; 2 — block of the ignition system harness to the ignition coil wiring harness; 3 — ignition coils VAZ-21104; 4 — immobilizer warning sensor; 5 — immobilizer control unit; 6 — spark plugs; 7 — nozzles; 8 — diagnostic block; 9 — block of the ignition system harness to the ABS cabin group harness; 10 - controller; 11 — electric fuel pump; 12 — block of the ignition system harness to the fuel level sensor harness; 13 — block of the fuel level sensor harness to the ignition system harness; 14 — block of the ignition system harness to the injector harness; 15 — injector harness block to the ignition system harness; 16 — block of the ignition system harness to the side door harness; 17 — speed sensor; 18 — idle speed regulator; 19 — throttle position sensor; 20 — coolant temperature sensor; 21 — mass air flow sensor; 22 — oil pressure warning lamp sensor; 23 - phase sensor; 24 — oxygen sensor; 25 — crankshaft position sensor; 26 — knock sensor; 27 — solenoid valve for purge of the adsorber; 28 — oil level sensor; 29 — coolant temperature indicator sensor; 30 — block of the ignition system harness to the instrument panel harness; 31 — block of the instrument panel harness to the ignition system harness; 32 — ignition relay; 33 - ignition relay fuse; 34 — fuse for the electric fuel pump power supply circuit; 35 — electric fuel pump relay; 36 — electric fan relay; 37 — controller power supply fuse; 38 — ignition system harness block to the air conditioner connector; 39 — instrument cluster; 40 — ignition switch; 41 — electric fan of the cooling system; 42 — on-board control system unit; 43 — starter relay; 44 — contacts of the 8-terminal blocks of the instrument panel harness and the front harness; 45 — contacts of the 21-terminal blocks of the instrument panel harness and the rear harness; 46 — trip computer; 47 - diagnostic connector.

• A - to the “plus” terminal of the battery;
• B1 — grounding point of the ignition coil wiring harness;
• B2 — grounding point of the fuel level sensor harness;
• B3, B4 - grounding points of the ignition system harness;
• C - to the starter;
• D - to the driver's door interior lamp switch.

According to the scheme described above, fuel regulation in a car is carried out. Moreover, it depends not only on the load of the valves in the engine, but also on the corresponding position relative to the throttle valve. With the help of a diagram of electrical wiring and valves, it is possible to understand which of the relays or fuses is malfunctioning and replace it in time. In this case, one of the main roles when supplying fuel is played by electrical equipment (controllers) that regulates the operation of the injector.

Interior heater of the VAZ 2110 and replacing it yourself

Sometimes a car ceases to please its owner. This happens when it starts to break down. One of the car breakdowns is the interior heater of the VAZ 2110, which must be properly disassembled and reassembled. After disassembling this mechanism, you can begin to repair or replace it. In general, the interior heating system of the VAZ 2110 is a complex structure, but it can be adjusted and repaired with your own hands.