Air lock in the cooling system of the VAZ 2107

Stove design

How to repair and tune the heating system circuit and what to do if the stove control system does not work? Before you learn how to remove, disassemble and remodel the unit in your car, let's understand the device. The heater is located in a housing inside the VAZ 2107 interior and is fixed to the partition of the engine compartment using four studs. The place where the interior heater connects to the body is sealed with a seal.

Heating system for the "seven"

Main elements of the system:

• ventilation device casing;
• radiator with air supply cover;
• ventilation device casing with air flow distributor cover.

The air flow that passes through the heater heats up and enters the passenger compartment. The VAZ 2107 stove is equipped with a radiator equipped with two hoses - outlet and inlet, which are led into the engine compartment and connected to the engine cooling system. The circuit is supplemented with a tap, which is installed in the supply line and is designed to regulate the flow of antifreeze into the system.

A fan is mounted directly under the radiator, the electric motor of which is located behind two elastic cushions located in the guide casing. The circuit is also supplemented with an additional resistor element installed in the electric motor power supply network. This resistor allows for faster rotation of the fan, which can be activated using the regulator on the control panel. As for the air ducts that are connected to the fan casing, they direct the air flow not only to the deflectors intended for blowing the side windows, but also to the windshield (the author of the video is A TO FRIEND).

The air flow is controlled by opening and closing the lids, as well as the stove dampers. There are many reasons why you need to remove, repair, tune and modify the VAZ 2107 stove yourself. As a rule, they are all related to the fact that the stove heats poorly or does not heat at all.

The main breakdowns of the unit are:

• the radiator unit, faucet, lines or pipe connections are leaking;
• The regulator for switching different operating modes does not work;
• replacing the VAZ heater motor may be necessary if the wires are damaged and cannot be repaired; sometimes the wires do not need to be changed, just cleaned;
• VAZ heater fan not working.

Prevention of air jams

To keep the engine in order and minimize the risk of airing the system, you must remember the first and most important rule - the car needs the caring attention of its owner. And a manifestation of this attention should be a mandatory monthly technical inspection of the car’s cooling system.

However, this requirement only means that you will drive the car into an inspection pit and examine places of possible leaks of coolant, oil and other liquids. Such preventive inspections can and should be done yourself - you will get to know your car better. It will also help you control your maintenance costs and eliminate operations that are not really needed, and learn to distinguish between those that are truly necessary.

In addition, the coolant in your car must meet quality and safety requirements. It’s not worth saving on it, as well as on other consumables for your car. After all, this is an increase in risks not only for the car, but also for you and your loved ones. A complete replacement of the coolant on VAZ vehicles should be carried out at least every five thousand kilometers.

Heater modernization

Every car owner knows that on a VAZ 2107, replacing the heater may be due to its poor performance. But not everyone decides to change the heater - most owners of the “Seven” decide to disassemble, repair, tune and remake the heater as a whole. There are many schemes for tuning and repair, but you need to take into account that it is not so easy to implement them at home. Without any problems, you can seal the joints of the system lines with nozzles with your own hands, and also redistribute the air flows according to need (the author of the video is VAZ 2101-2107 REPAIR AND MAINTENANCE).

However, such a modification of the stove will not improve the microclimate in the cabin. If you want the air in the cabin to be warmer, you will need to increase the air flow with a new radiator, since the factory device will not allow this idea. Fan replacement is also necessary in such cases. The best option would be to install a V8 electric motor.

So, the repair and tuning scheme for the heating system is as follows:

1. First you need to know how to remove the stove. You are required to dismantle the lower part of the structure, namely the casing on top of which the fan is installed; the latter can be dismantled.
2. After removing the fan, you should carefully cut off one of the so-called ridges that supply air flow to the feet of the front passenger and driver. This is done necessarily, since the electric motor from the “eight” is much longer.
3. The impeller is dismantled. Inside this element, it is necessary to increase the diameter of the hole into which the shaft must subsequently be carefully installed. Make sure that the new structure can fit into the installation location as securely as possible.
4. Before installing a new fan, diagnose its functionality.
5. The resistor should be replaced, since it is thanks to this element that the fan will operate much quieter. As practice shows, it is best to install a resistor from the same “eight”.
6. The vent switch should also be replaced. When the heating system is operating, another current will begin to flow to it. Accordingly, over time this button may fail.

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Folk way

This method of deflation came to us from the people. That is, in a logical way, drivers came up with the idea of ​​​​parking the car at an angle so that the air bubble would come out of the heating system during certain actions.

So, you need to find a hill with a slight slope. An overpass will also do. Drive the car onto it so that the front is as high as the rear as possible. The plug will go away if your engine idles for a couple of minutes. However, this method does not always help. However, this method is the cheapest and easiest, so it makes sense to try it. If it doesn’t help, read on to learn how to blow out the heater on a VAZ-2107.

Fan replacement

Dismantling

The fan assembly procedure is as follows:

1. The lower heater regulator must be moved to the extreme position towards the passenger. The control panel and the glove box with shelf are removed. It is also necessary to remove the center console with the audio system.
2. Using a wrench, unscrew and remove the rod designed to control the damper. Unscrew the nut securing the system radiator skin, as well as the nut located behind the glove box.
3. Disconnect the air line attached to the casing of the radiator unit and remove the fan casing, as well as the device itself.
4. Pull out the rubber seals and disconnect the red cable.
5. Using a screwdriver, you need to remove the retaining ring, which is located on the drive shaft. You should also remove the fan impellers and adjusting rings.

1. Remove the fan.

2. Disassemble the device and repair.

Repair

A disassembled fan must be repaired or replaced with a new, more powerful one, but experts do not advise doing this, since the heating system will have to be completely improved. As for the repair itself, this procedure will not take much time, since all actions associated with it only involve removing and assembling the mechanism. In general, there is nothing difficult about this - if you need to replace the impeller or electric motor, this can be done without problems.

Assembly

How to assemble the device:

1. First, the adjusting rings are mounted along with the impeller.
2. The retaining rings are installed and the red wire is connected back.
3. The ventilation device is mounted at the installation site and secured with brackets.
4. The central part of the console with the audio system is connected.
5. The glove box, control panel, and shelf are put in place.

Common problems and solutions

Despite the simplicity of the design, the heating system of the VAZ-2107 fails quite often. Its most vulnerable places are:

• heater valve;
• fan (electric motor);
• stove radiator.

The heater valve of the “Seven”, like all classic VAZs, breaks down most often. Its most common malfunction is a leak caused by depressurization of the housing. This problem can be solved by replacing the spare part. Repairing the faucet is impossible in most cases.

Another common failure is a broken drive cable. To replace it, you will have to dismantle the tap, because it is impossible to get to its fastening on the side of the locking device without removing it. You should also monitor the cable tension. If you allow it to sag, the faucet valve will not open completely.

As for the fan, it cannot be called reliable. Usually it fails with the onset of cold weather. The cause of an electric motor malfunction, at best, is worn out bearings or brushes, at worst, a break or short circuit in the windings. Repairing the electric motor or replacing it can correct the situation.

The heater radiator also has two “diseases”: leaking and clogging. The first malfunction can be caused either by mechanical damage or by chemical processes. Today, radiators are made of aluminum alloy, which is not particularly resistant to technical fluids. And if old copper radiators could still be soldered, then modern ones can only be replaced.

Heat exchanger clogging also occurs as a result of chemical processes. Scale gradually settles on the walls of the device tubes and over time limits the normal circulation of the coolant. This leads to the fact that the air pumped into the cabin does not warm up to the required temperature. You can get rid of this problem by flushing the radiator with special liquids, or, in extreme cases, by replacing the device.

How to improve the air passage to the windshield of a VAZ 2107

As a result, warmer air is supplied to the feet, and a cooler flow enters the glazing.

Design features

Electric motor . The commutator electric motor of the fan is powered by direct current; for more information about electric fans, see the website.

To control the fan speed, a four-position regulator is provided on the dashboard. The rotation speed of the electric motor is changed by connecting or disconnecting additional resistors.

When the engine is turned on directly (without resistors), the rotation speed will be maximum. The electric motor cannot be repaired and if it fails, it is replaced along with the fan wheel.

The only thing that can be done to maintain the engine is to clean the manifold if necessary.

Heater.

The results of high-quality improvements - warmth and comfort in your cabin

After you check the rational arrangement of all new elements of the heating system, you need to carefully apply sealant at the junction of the cuffs and hoses with the stove body. Simple tuning of the heater, which can significantly increase the efficiency of heating the interior, has been completed. Now you will see a big difference in the level of comfort in the cabin before modifications and after upgrading the stove. In particular, this concerns not only the convenience of the driver and passengers, but also the quality of the glass blowing, which tended to fog up due to an insufficiently powerful flow of warm air.

Diagram and design of the heating system in the VAZ-2107

The design of the heating unit on “sevens” with a carburetor engine or injector is identical:

1. Blower The line is aimed at blowing the windshield.
2. Airflow cover.
3. Radiator unit.
4. Radiator protective cover.
5. Heating unit faucet pull.
6. Radiator outlet line.
7. Underwater pipe of the radiator assembly.
8. Radiator tap. Used to drain refrigerant.
9. Blower

Therefore, it is much better and more convenient to carry out a full audit of the system, adjust the operation of the equipment and obtain the normal functions of this vital part of the microclimate in the car.