The VAZ 2112 stove stopped working

Stove VAZ 2110 perhaps the most problematic and capricious mechanism in the entire car design. You cannot do without a stove or a faulty interior heater radiator on a VAZ 2110, given our cold climate. If in the summer a non-working stove may not bother you, then with the onset of the cold season it often turns out that the stove on the VAZ-2110 blows cold air

Note from the author of the article: On the VAZ of the 10th family, which includes the VAZ 2110-2112 models, the designers used an electronically controlled interior heating system, thanks to which the temperature set by the driver is maintained automatically.

Possible causes of malfunction

Before carrying out repairs, you should carefully study the possible causes of a malfunction of the car heater fan:

Burnt fuse. The real reason is the most banal and simple, but at the same time it is the one that leads to the greatest problems in solving the existing issue. Replacing a fuse turns out to be a very simple procedure that any motorist can successfully handle. Despite simple repairs, it is extremely difficult to detect the short circuit that led to the blown fuse.
Oxidation of contacts that should be used to establish the operation of a car heater.
The ignition relay does not allow the heater to turn on and start working successfully.
An additional resistor can result in only the third speed being operational.
A faulty car interior heating switch requires replacing the fuse.
A non-working electric fan motor is another important reason. In this case, it is necessary to replace the heater motor or at least check its contact with the vehicle. In most cases, the cause is hidden in a burnt-out electric motor, poor contact with the machine, or sticking electric motor brushes.

Regardless of the cause of the malfunction, you can successfully adjust your car heater. The most important thing is to understand what exactly is the cause of the breakdown or partial disruption of the functionality of the heating equipment.

If diagnostics have confirmed that the cause lies in the heater motor, replacing the heater fan most often becomes a mandatory task. How to carry out such a responsible procedure and how easy does it promise to be?

How to prepare for the event

If you need to repair a VAZ stove fan, you need to make sure you have the necessary tools:

head 10 millimeters, deep;
Phillips screwdriver (2 varieties: regular and short);
ratchet with extension.

Only if all the tools are available can the main activities be carried out. Of course, for a successful result, at least minimal experience with wrenches and screwdrivers is required. If there is no relevant experience, the task at hand becomes significantly more difficult.

How to hold a planned event

In order to get to the electric motor of a car heater, you must first open the hood and remove the battery terminal with a minus sign. Only after this can you go through all the following stages. If the fan does not work at first, you need to carry out the planned event correctly in order to achieve a successful result.

First, the windshield wipers are removed. To do this, you need to carefully pry off their rubber caps and remove them, then take a 10mm wrench, unscrew the nuts, and disconnect the brushes.
The next stage is to carefully pry off the decorative plugs. It is best to remove them with a slotted screwdriver. In this case, you need to take care to carefully unscrew the screws used to secure the frill. Then you need to remove the nuts located on the edges using a 10mm wrench. Once the decorative plugs and frills have been removed, you can move on.
Now you can remove the rubber seal and carefully unscrew the self-tapping screws with which the heater’s engine compartment shield is attached to the entire structure.
Then remove the hose, which allows you to supply washer fluid to the nozzles.
The most difficult and responsible task is trying to get to the right panel of the engine compartment and get it out. The right shield is attached using two nuts that can be easily unscrewed. However, the position will not be so comfortable during this procedure. Fortunately, the shield can be easily pulled out after a few turns, so it is not necessary to unscrew the nuts all the way.
Before the shield can be disconnected, you need to remove the clamps from the hose.
Now you need to work on the cabin filter, from the cover of which four self-tapping screws are unscrewed for subsequent removal of the structure.
Now you can see the stove motor. To proceed further, you need to disconnect the heater motor block and the resistor block.
Now you can pull out the left side of the stove. Fortunately, the heater motor on the VAZ will be pulled out almost immediately.
After these steps, it becomes possible to replace the motor. In this case, the heater will work if a suitable motor is used.
Reassembly is carried out in the order described above, but all steps are carried out exactly the opposite.

Knowing how to change the heater motor on a VAZ-2112 car, you can count on a successful result. A working heating device in the car interior will be available again after a few hours.

Repair features

So, how should you repair your stove damper? First of all, you need to disassemble the damper and then replace it.

Disassembly stages

Knowing where the heater damper is located on a VAZ-2112, and having carefully read the vehicle’s instructions, you can understand what steps you should go through:

The existing liquid, which is to be used for cooling, is first poured out completely.
Disconnecting the car battery by disconnecting the minus terminal.
Removing facing materials, windshield trim and soundproofing upholstery.
Removing the fan that is installed inside the stove.
Disconnecting the clamp that is part of the vacuum hose.
Removing the heater air intake housing. These actions are sensitive and time consuming. If you first remove the dashboard, you can understand how to get to the VAZ-2112 heater damper in the shortest possible time.
The next step is to remove all the parts used to attach the radiator.
After this, the rear heater casing is disconnected.
The radiator is pulled out of the heater.
Now you can change the part itself. After a successful replacement, the problem associated with the fact that the heater damper on the VAZ-2112 does not work is successfully resolved.

Knowing how to remove the heater damper, you should ensure that reassembly is carried out correctly.

Assembly steps

The new part must be installed in a special way: the fork on its axis must be reliably engaged with the lever. This requires an open damper mechanism, so it is best to leave it raised. Otherwise, the element will not be able to open according to the optimal pattern and the stove will still not work. Only correct installation guarantees that the heater will function successfully.

If you are interested in how to change the VAZ-2112 heater damper, you should understand that everything will be done in the reverse order.

At the end of the procedure, it is mandatory to fill in the coolant and check the functionality of the part, the tightness of the hose structure and all connections. Then you need to turn on the heater and monitor it carefully.

Only if there is no such problem as the damper of the VAZ-2112 stove does not open, can you remain satisfied with the result of replacing the equipment.

The stove releases cold air

The first thing to do is to determine the cause of the breakdown. This will help you find ways to solve it. But there are quite a lot of them, so let's look at the most popular ones.

One common reason is that only cold air comes out of the unit. This is the first sign that the stove is not working properly. The reason lies in the fact that the interior temperature sensor has broken down - it is responsible for what conditions are in the cabin and whether they correspond to those set by the driver. If it fails, then its readings are incorrect. Thus, the stove receives information that it is hot in the cabin. It will therefore produce cold air to make conditions more comfortable.

It's easy to fix this problem. There are several steps you need to take. First, remove the lampshade by unscrewing it. Then install a new sensor and check it for serviceability.

In this case, care must be taken not to reverse the polarity. Otherwise, the device will not work properly.

Also, the reason that cold air comes out of the stove can be a breakdown of the gear motor. To determine it, you must first check the temperature sensor for serviceability. If everything is in order with the latter, then clearly the problem lies in the gearmotor. It is worth noting that this part, like the previous one, cannot be repaired. The only way to solve the problem is to replace it with a new one.

Coolant leaked from the heater

Determining the cause of a stove failure is usually simple. This does not require special equipment. It is enough to examine it. For example, coolant leaked. This will also create an unpleasant odor in the cabin. The reason lies in the fact that the radiator has leaked or the faucet installed on the stove has broken.

To solve the problem, you need to replace the radiator. This car can use either aluminum or copper. There is not much difference between them. Therefore, you can choose the one you like. It is worth noting that copper can be repaired. This, of course, affects its price, which is higher. The aluminum radiator cannot be repaired. But it also costs much less. Also pay attention to whether the device is painted or not. It is better to choose devices of their original form, as their thermal conductivity is better.

If the faucet on the stove breaks, you will also need to replace it with a new one. It comes in two types: VAZ or ceramic. The first option is cheaper, but its service life is short. If you use the stove frequently, it will need to be replaced after two or three seasons.

As for the ceramic faucet, its cost is higher. But such a device has a long service life. It is able to function perfectly for more than five seasons.

You should also remember that antifreeze can leak from different places. First you need to define it. Only then go shopping for a new part. The cost of both the radiator and faucet is more than 1,200 rubles. After this, you can start replacing.

Correctly determining the cause of a stove failure will allow you to quickly and efficiently restore the operation of the device. Therefore, carefully inspect the device and determine what led to the failure.

Main Culprits

Let's try to find the culprit that may be causing the stove to not work.

temperature sensor

If the sensor works well, the damper will move depending on the value set on the regulator. You can check this by removing the deflectors and observing the movement of the damper.

Checking the operation of the coolant sensor at home with a multimeter

You should also check the resistance of the temperature sensor in the cabin itself. At 20 degrees the resistance should be 20 ohms, at 15 degrees - 25 ohms.

Stove controller

To check the operation of this element, you need to pull it out of its socket. Next, you need to turn on the ignition and turn the temperature switch knob. In this case, you should measure what voltage is on the wires in different positions of the regulator (these are brown and pink wires).

Disassembled stove controller

If everything works properly, then voltage on the wires will appear depending on the position of the switch itself. This voltage should subside on its own within 10-15 seconds after turning the regulator knob . If this does not happen, then the controller is acting up. It can only be completely replaced.

Gearmotor

Gear motor diagram with explanation

Due to the fact that it is out of order, the stove on the VAZ-2112 can also malfunction. It is quite difficult to check the operation of this unit. To do this you need to get into the engine compartment. After removing the sound insulation and frill, you will need to remove the wiper drive. There will be two connectors. The connector to which the brown and pink wires fit will be the connector of the gearmotor.

Initially, you need to check if the wires themselves are broken. To do this, you will also have to check the voltage at the gearmotor connector. If the wires are not broken, then there will be voltage.

To check the condition of the gearbox itself, you need to apply a voltage of 12 V to the connector. When it starts to spin, then everything is in order. If this does not happen, the part will have to be completely changed. If the gearbox spins, but the stove does not work, then the reason must be looked for in the wires and connectors. They may be oxidized.

The heater only works in one position

There are several options here. We'll have to check them all.

Test the wires in the controller . They may break or burn out.
The wires in the relay may have come loose . You need to look for the relay block in the engine compartment.
An additional resistor on the heater housing may burn out . It is he who regulates the speed of the fan.

Cold air coming from the damper

This may be due to a faulty thermostat or air temperature sensor. It is also possible that the antifreeze level in the cooling system is low.

Additional work

The reasons for poor heater performance may be related to a leak in the radiator. To check it, you will need to remove the stove. If the radiator leaks, then it is replaced with a new analogue. If there are air pockets in the radiator, then cold air blows. In this case, the car should be positioned so that the front wheels are higher than the rear tires. Then open the tap and press the gas pedal. The motor should run for 5 minutes. Then we return everything to its original position.

If the stove does not heat, it is recommended to check the faucet for serviceability. This element is located under the hood. You can eliminate a leaking faucet by replacing it with a new analogue. Experts do not recommend removing the tap from the 2110 heating system. Otherwise, the driver will not be able to control the temperature of the antifreeze. If the stove does not blow well, insulation work will need to be done. We seal the cracks in the panel with anti-squeak. If the valves are jammed, the stove may not work. If the VAZ-2110 is equipped with valves (in the heater hoses), it is necessary to check their operation.

If the stove on a VAZ 2110 blows cold air, but is itself heated to a temperature of 90 degrees, then the reason is hidden in the standard air ducts. Most likely, they are either damaged or have fallen off from the stove itself. And to get to them you will have to disassemble and remove the entire panel. If you still cannot restore them, you can simply replace them with corrugated hoses purchased from building materials and install them. And seal all joints tightly and thoroughly with polyurethane foam or modelin.

The VAZ 2112 stove does not work (reasons and repairs)

For any owner of a VAZ 2112, as well as any other car, the most unpleasant problem in winter is the failure of the stove. In this article, we will look at why the VAZ 2112 stove does not work (reasons and repairs). At the same time, you need to understand that we cannot cover all possible options in one publication, so we will present the most common breakdowns and ways to solve them.

The stove doesn't work at all

In this case, some node of the system has broken down.
All components of the structure must be checked. But, as practice shows, the fan is to blame. If everything is fine, next check the thermostat. After checking all components and determining the malfunction, consider carrying out a major overhaul of the stove. Having repaired the system once, you will be able to drive comfortably for a long time without all sorts of surprises.

If the cost of a major repair is equal to the price of a new heater. Then the best way out of the situation would be to purchase and install a new unit. In this case, you will travel approximately 15 thousand kilometers without any problems.

To summarize the article, we note that we examined the main malfunctions that can lead to poor operation of the stove on the VAZ-2112. Now you know how to find and repair a heater failure. If you do not have experience in carrying out this type of work, the best solution would be to contact a service station.

Problems with the VAZ 2112 stove and its repair

The design of the VAZ 2112 stove heater differs from the previous VAZ-2108, 2109 family. When the engine is running, the radiator temperature should correspond to the general temperature of the cooling system. This means that the damper is always open and the supply of antifreeze (antifreeze) does not stop. The control system is electrical; processes are controlled by electronic sensors and controllers.

The center console has two control levers and one regulator. The driver, as necessary, sets the air temperature in the cabin, activates the desired mode (speed) of the fan, and directs the air flow to heat the glass and legs. A special electric thermometer installed in the ceiling controls the temperature. As soon as the temperature drops, the controller transmits a signal to the micromotor reducer, the heater is activated, and a flow of warm air enters the cabin. A malfunction of one or more units causes a breakdown, the VAZ 2112 stove does not heat well, and prompt repairs are required.

Temperature does not change

In this case, you fail to adjust the internal climate, and the result is sometimes both unbearable heat and cold. The reason for this may be the following:

The control unit does not receive information from the temperature sensor. This measuring device is installed in the ceiling next to the lampshade. To check its functionality, turn the adjustment knob to its extreme position (several times). If there is no reaction or it appears in the extreme position, it is necessary to change the sensor.
Damper failure. It is quite possible that the damper is simply jammed and is now unable to turn. The reason for this is oxidation of the mechanism fastenings. It is possible to get to the damper only from the engine compartment. Initially, you need to remove the deflectors, bend the antennae, and only then try to move the element.

The flap may be deformed. There is a plastic part on the VAZ-2112. Therefore, if you change an element, it is better to install an aluminum one. Such a damper will last longer and will retain heat better.

In addition, the damper may not work correctly due to failure of the drive motor. To check, you need to remove the insulation and frill. This engine cannot be repaired, it can only be replaced with a new one.

Some drivers ignore the need to replace the motor and leave the throttle open. In this case, it will not be possible to regulate the temperature in the cabin, and hot air will constantly flow.

The device of the VAZ 2112 stove

Heater parts

electro-pneumatic valve;
front housing;
water deflector;
control valve;
back of the case;
radiator;
radiator casing;
lid;
resistor;
Electrical engine.

Heater ducts and controls

Rear heating ducts.
Plastic lining of the tunnel.
Foot heating channels.
Ventilation nozzles of the central part.
Side nozzles.
Heated front doors.
Mechanical heating lever.
Distributor housing.
Damper for heating feet, windshield.
Heater.

It is important to know. Differences in the design of the old and new VAZ 2112 in the shape of the heater radiator, the SAUO controller, and the micro-gearbox. Conventionally divided before 2004 and after. When purchasing, be careful not to hand over unnecessary parts.

From the above it follows that the heating system of the VAZ 2112 operates separately. The VAZ 2112 stove pumps air at the required temperature into the cabin. The pipes supply flow to heat the windshield, passengers' feet, and rear row of seats. Deformation of the dampers and deflectors creates an obstacle to the air flow, so the stove does not blow well and requires diagnostics.

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.

All parts are packaged in a block with additional valves, shields, and fittings. This entire device is housed in a housing and is located under the hood closer to the instrument panel.

2. The next block represents the air ducts of the VAZ 2110. They extend directly from the stove and provide:

Interior ventilation through central nozzles;
The air distributor works to supply heat (or regular air for ventilation);
Two air ducts are directed to the rear of the cabin;
There is a whole system of five nozzles for heating the feet;
Two side air ducts provide heating for the side windows and part of the interior, providing better heating;
Two nozzles for ventilation.

This, in a nutshell, is the principle of distribution of hot or cold air inside the VAZ 2110.

3. The electronic control unit for the stove operates from the passenger compartment. It includes:

Controller handle. This device allows you to set the temperature in the cabin that the stove unit should produce. It turns on by turning the knob and sets the temperature from the air, the temperature of which will correspond to that outside, up to 30°C. Most often, this part is called the ACS controller (automatic heater control system);
The temperature sensor is responsible for turning on the heater when the temperature in the cabin drops by 2 degrees against the set one. The sensor has a microfan, and if the control knob is in position A, then the micromotor in the stove block turns on and the damper begins to operate, ensuring proper heating. Therefore, before starting repairs of the heating system, the operation of this sensor is usually checked. It is located next to the heating lamp on the ceiling of the VAZ 2110. Since it is not repairable, in the event of a breakdown this device should be replaced immediately.

This material will help you quickly and efficiently replace the stove fan in a VAZ 2110: https://vazweb.ru/desyatka/otoplenie/zamena-ventilyatora-pechki.html

Ceiling interior air temperature sensor

Characteristic symptoms of malfunctions

In practice, there are five most common signs:

The VAZ 2112 heater does not work, it constantly rotates at one stable speed;
Temperature is not adjustable;
The air flow control flaps are fixed and cannot be adjusted;
Sensor - regulator on the ceiling is in a faulty state;
Unstable operation of the ACS controller (automatic heater control system)
Antifreeze leaking from under the radiator.

The list is not exhaustive, but only indicates the main malfunctions of the VAZ 2112 stove. Prevention will require a visit to a service station followed by diagnostics.

Causes of breakdowns

violation of the terms of scheduled technical inspection;
installation of non-original parts, components, consumables;
filling the cooling system with antifreeze (antifreeze) of low quality or with chemical impurities, the quantitative composition of which exceeds permissible standards;
mechanical damage to the fluid supply line, accident, collision, impact, violation of installation technology;
short circuit in the network, electrical circuit, which contributed to the failure of the controller, sensors, resistors;
damage to the damper control lever, malfunction of the dampers;
poor terminal contact;
damage to electrical wiring and cable sections.

Trouble-shooting

Checking the cabin air temperature sensor

You can check the serviceability yourself; special skills are not required. Carefully remove the sensor from its original place. We find the contacts on the back side. Using a multimeter, apply a voltage of 1.2V. We set the regulators of the automatic heater control system to the “Min”, “Max” positions. The motor should not be activated.

The second method is to turn off the cabin air sensor. Check fan speed settings. The first speed (“A”) should be inactive.

Video: Heater VAZ 2110, 11, 12. Design and principle of operation.

Checking the proper operation of the automatic control system

The proper operation is checked with a multimeter. The voltage at the terminals of the pink and brown wires is measured, the ignition is activated. Smoothly turn the temperature regulator; the arrow on the multimeter display should show an increase in voltage.

On old-style heaters, at maximum voltage, the controller value remains unchanged. Take this into account so as not to make hasty conclusions about the malfunction of a particular unit.

The cause of controller malfunction may also be deformed dampers. To verify this and eliminate the breakdown, we disassemble the heater.

Prevention of the damper of the heating system of VAZ 2112

To be precise, two dampers are subject to inspection; this is the number of them present in the VAZ 2112. The cold air intake is regulated in the upper part. In the lower part, warm (hot) air is supplied to the car interior. Due to wear on the drive mechanism, the damper opens halfway or partially, the air flow is reduced, and the interior is not heated sufficiently.

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 has an injector instead of a carburetor, are not particularly different in design.

So, the immediate differences:

The main difference between the new stove and the old one is in 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;
In addition, the SAUO controller is also not exactly like that. 4 or 5 position controllers manufactured before the fall of 2003 have already been discontinued and are not suitable for new heater models;
The micro-gearboxes are also different, starting from release in September 2003. They differ in resistors (shaft position sensors), so you need to check whether the resistor in the MMR model that you purchased is interchangeable.