Heating system VAZ 2110 8 valves carburetor connection diagram

To repair your car yourself, you need to know the structure of the main components and the principle of their operation. Such knowledge and skills come with experience during the operation of the machine. Problems often arise with the interior heating system. Most of the malfunctions of the VAZ 2110-2112 stove can be fixed yourself if you have the necessary skills.

The role of the heater in the car interior is difficult to overestimate; it creates comfortable conditions for the driver and passengers. We will try to highlight the main processes that are described in the specialized literature in simple language.

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.

Heater parts VAZ 2110

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.

Ceiling interior air temperature sensor

Replacement procedure

The radiator of the VAZ-2110 stove is replaced from under the hood. Before starting work, carefully remove the insulation from the rear wall of the engine compartment. In the opened space you can see the stove body, which is under plastic protection. To remove the heater radiator, you will have to dismantle the wipers, plastic protection, air intakes, as well as the plastic ski under the windshield. When removing the ski, carefully remove the wiring that goes to the windshield washer. They are unhooked directly near the washer reservoir, then carefully removed from the engine compartment.

Next, the plastic housing containing the heating system radiator is dismantled. Before this, you need to unscrew all visible screws and carefully unclip the latches holding its components. This is a complex and painstaking job, in which there is no need to rush so as not to damage the fragile plastic parts.

When removing housing elements, do not damage the stove motor, which is attached to its cover. There is one more feature when dismantling the plastic protection. When removing the plastic housing that directly covers the heater radiator, it is necessary to unclip two latches that are located in its lower part. The problem is that they are absolutely invisible from the engine compartment; everything needs to be done with a screwdriver, carefully and by touch, so as not to break off these fasteners.

The radiator is located in the central part of the case and can be seen after removing the casing. On the right side there are hoses that go to the stove, and a hose leading to the expansion tank. To continue operation, you must drain the coolant from the cooling system. This can be done by unscrewing the hose that is attached to the injector. The disconnected hose must be taken out into some container so that it is below the level of the stove, then all the antifreeze will leave the radiator. After this, you can disconnect the hoses from the stove, since it will be dry.

Sometimes it happens that the hoses become woody, in which case it is better to simply cut them off and then replace them. After this, you can remove the heater radiator from the socket with virtually no effort. By looking at the removed part, you can identify leaks of antifreeze - a sure sign of depressurization of the radiator.

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:

1. 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;
2. 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;
3. 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.

VAZ 2110 stove diagram and functional features

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.

How to modify and modernize the stove with your own hands?

There are many options for tuning and improving the operation of the heating unit, which you can do yourself. To implement each task, you will have to completely or partially disassemble the heating unit.

Before remaking the heating unit of the VAZ 2110, it is necessary to seal the main air duct as much as possible.

Improved side ventilation

There are two ways to improve side ventilation:

• lay the corrugation, which will be aimed at blowing the glass of the side windows;
• modification of the VAZ 2110 stove may involve sealing all the cracks that lead to loss of air flow.

The first option is more effective for blowing the feet of passengers sitting in front and behind. In fact, practice shows that this method has no effect for blowing glass on windows. Therefore, to solve the problem, all the cracks in the panel are sealed.

The task is carried out using silicone sealant or a special anti-creaking agent. All cracks located around the perimeter on the upper and lower components of the center console panel are sealed. All holes located around the fasteners are treated with silicone.

Damper modernization

In cars manufactured after 2003, setting the damper to blow the feet does not produce results, since the heater blows in all directions. In older versions of the car, the damper works better.

The upgrade procedure is performed as follows:

1. Using a metal saw, you should cut out the end parts of the damper. There is no need to dismantle the elements of the heating system. The place that needs to be cut is marked in red in the photo below.
2. The flap intended for blowing the windshield does not need to be touched. If the consumer cuts off the end parts on it, then the airflow along the edges of the windshield will be worse.
3. To increase air intake, a piece is cut out onto the windshield on the driver's side. This part is marked in green in the photo above.
4. It will take a long time to cut out, it must be done carefully. The task may take several hours to complete.
5. Next you will need a piece of soft aluminum. Alternatively, you can use iron from a coffee can, as shown in the photo. The iron is cut out with a regular knife and fixed on the stove elements.

Improved foot airflow efficiency

To complete the task you will need:

• new boots, the type of parts does not matter;
• grille, can be used from old speakers, you need to cut a circle out of it, if there is no grille, you can use rubber pads for a Fiat Punto car;
• A piece of rubber can be purchased at the car market.

The main reasons for poor operation of an electric furnace

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);

What to do if the VAZ 2110 stove does not heat up

Comfort in the cabin when operating the car in winter is ensured by a stove in the cabin. Before the advent of the “tenth” family of models, AvtoVAZ equipped its cars with a simple mechanically controlled heating system. Starting with the VAZ-2110 model, designers revised the design of the stove and improved its control mechanism. Such modifications increase the convenience of adjusting the heating operation, and sometimes cause failure or improper functioning of the interior heating.

The design of the heating system of the VAZ-2110

The concept of interior heating on the VAZ-2110 remains the same - the air supplied to the cabin is heated by the cooling system. To do this, a radiator is installed in the cabin, under the front panel, which is included in the cooling system; heated antifreeze moves through it. The air passing through the radiator is supplied through the air intake. After heating, the air flow through the air ducts is supplied to the necessary areas - the windshield, legs, torso.

Forced air circulation is provided, which increases the efficiency of the distribution of warm flow throughout the cabin. For this purpose, the stove is equipped with a fan driven by an electric motor.

The air heating temperature is regulated by dampers. One of them allows the flow either through the radiator (for heating) or bypassing it. The damper divides the flow to obtain the desired temperature - one part of it goes through the radiator, and the second bypasses it, after which it is mixed, the degree of heating is regulated and supplied to the air ducts.

The second damper is designed to shut off the air supply to the cabin from the outside. Thanks to it, a closed air circulation mode is established.

Typical faults

Below are the main malfunctions of heating systems:

1. When the heating is turned on, hot air blows. In this case, there may be many reasons. It is necessary to diagnose the heater motor, gear motor, temperature controller on the ceiling, and the ACS controller. In some cases, the problem lies in the radiator, which, due to incorrect operation, cannot warm up the air flow that passes through it.
2. Often the cause of incorrect operation of the heating system is dampers that are unable to open or close well. Since the damper is made of plastic, it tends to deform over time; in this case, installing a metal damper will solve the problem. To understand the condition of this element, you simply need to dismantle the deflector. Turn on the heating and try turning the controls - if the damper does not respond to your actions at all, then you need to look for the problem further.
3. Fan failure can be determined by the absence of characteristic noise. But if there is no noise, the problem may be a failed fuse or oxidized wiring contacts. In order to get to the fan, you need to dismantle the so-called apron.
4. In the engine compartment there is a radiator for the heating system, next to the fan. To remove the radiator, the fan will also need to be removed. If the radiator begins to leak, you will be able to see puddles of coolant under the floor mats; sometimes this problem is caused by bad clamps. One way or another, it is necessary to determine the location of the leak and solve the problem to restore the system's functionality.
5. Many owners of "ten" are faced with such a problem as the lack of backlight on the heater control panel. Car enthusiasts associate the lack of lighting with stove malfunctions, but this is completely wrong. If there is no backlight, this may only be due to the wiring (video author - Aleks B).

Stove control

Previously, the dampers on VAZ were controlled mechanically - the damper was connected by a cable to a handle on the heater control unit. Additionally, the heater was equipped with a tap to shut off the supply of antifreeze to the heater radiator, which was regulated by a handle on the control unit.

Video: The stove on the VAZ 2110 does not heat up? Replacing the heater damper gearmotor

On the VAZ-2110, the shut-off valve is no longer installed, and the heater is turned off in the summer using a damper, which, when completely closed, separates the radiator from the passenger compartment. The mechanical control of the dampers was replaced with an electromechanical one - a micromotor gearbox was installed. Heating control for VAZ-2110 includes:

• controller of the automatic heater control system (AHC);
• temperature sensor;
• damper position sensor;
• micromotor gearbox

The controller is equipped with a front panel with two handles - the left one is responsible for adjusting the temperature, the right one is for operating the fan. Models of the 10th family use controllers, the difference between which comes down to the number of fan operating modes and the presence of an automatic operating mode.

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.

Principle of operation

The operating principle of such a control system is simple - the driver uses the left handle to set the desired temperature (completely cold or in the range from 16 to 28 degrees). Based on the set mode, the controller supplies power to the micromotor gearbox and it sets the dampers to the desired position.

Two-way communication is used between these elements - a position sensor is installed on the gearbox, which “informs” the controller about the opening angle. Thanks to the installed temperature sensor (located on the ceiling), the controller constantly monitors the degree of heating of the air in the cabin, based on which it adjusts the position of the damper to maintain the temperature set by the driver.

Heater prevention

To prevent damage to the heating unit, it is necessary to follow the preventive measures of the system:

1. The refrigerant level in the expansion tank is periodically checked. If there is a shortage, antifreeze is added, the causes of the leak must be eliminated.
2. To ensure high-quality operation of the cooling system, only high-quality antifreeze is used.
3. The engine temperature must not be allowed to increase. You can monitor this parameter using a sensor located on the instrument panel.
4. Water is not used instead of refrigerant, since this liquid has a lower boiling point compared to antifreeze. Using tap water will cause rust and rapid wear of system components. Filling with water is allowed only as a last resort - if a leak occurs, the problem is discovered on the road, and there are no car shops nearby.

Malfunctions of the VAZ 2110 stove and their elimination

VAZ-2110 owners are faced with the problem of a non-working or malfunctioning stove. The malfunction boils down to the fact that the air does not heat up, the heater supplies hot air, or there is uneven heating - cold air goes to the windshield, but well-heated air goes to the foot area.

Why does the stove not heat well?

These symptoms occur due to a malfunction in the stove control system:

1. Damage to the ACS controller.
2. Malfunction of the micromotor gearbox.
3. Damper deformed or jammed.
4. Temperature sensor malfunction.

To identify the problem, first determine in which branch of the control system the malfunction occurred. To do this, start the engine, turn on the heater fan at maximum speed, and then turn the temperature control knob from “Min” to “Max” and listen to whether the noise changes from the fan operation. If the “controller-gearbox” branch is working properly, then the dampers move, and by changing the direction of air flow, the noise from the stove operation changes in tone.

But if the sound of operation does not change, the reason lies in the controller, gearbox or dampers.

To check the controller, replace it with a known good one and check whether the operation of the stove has changed. The next thing to check is the gear motor. The difficulty of checking is that it is located under the “jabot” on the engine side, and it is difficult to get to the gearbox. This control branch may not work due to jammed dampers.

To check the “controller-temperature sensor” branch, disconnect the wires from the sensor. Without its readings, the controller controls the damper based on the temperature set by the driver. If the problem with the operation of the stove lay in the temperature sensor, then after it is turned off, the normal functioning of the heating system will be restored, with the only difference that the automatic fan mode will stop working and the ACS will not be able to adjust the temperature of the air flow.

More often, problems arise with the controller and gearmotor. These units can be repaired, but since their price is low, it is easier to replace them with new ones.

Video: The stove on the VAZ 2110 does not heat up? Heater damper repair

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.

1. 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.
2. Next you need to move the frill forward. This process will take quite a long time, so be patient.
3. 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.
4. Remove the body of your stove. 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.
5. After this comes the stage of dismantling the cabin filter. Check its current status. If the filter is dirty, this is an excellent reason to replace it.
6. The next stage involves removing the second part of the housing.
7. Loosen the clamps used on the hoses a little. This will allow you to easily remove the hoses.
8. Having applied some effort, you can now finally remove the radiator from its seat.