Heater VAZ 2107: design, malfunctions and repairs, modification of the heater

As you know, a car’s heating system allows you to maintain a microclimate in the cabin, effectively warm windows, remove moisture, etc. In simple words, the health of the driver and passengers, comfort when operating the vehicle, as well as safety when driving a car directly depends on the state of this system.

Taking into account the fact that “classic” domestic VAZ models (for example, 2103, 2106, 2107) remain quite common on the roads, a common problem is that the VAZ 2107 or 2106 heater does not work. In this article we will focus on the 2107 model, consider the design of the heater on such a car, and also what to do if the VAZ 2107 stove does not heat well.

How the stove 2107 works

So, the heating system of the VAZ 2107 includes:

heater;
fan;
heater control unit;

From the outside, air enters through the air intake into the casing of the air intake chamber. The camera is located in the engine compartment (in the area under the windshield). The air is then redirected to the heater, where moisture condensation occurs.

An important element is the heater radiator on the VAZ 2107, which heats up due to the circulation of coolant (coolant) in the engine cooling system. In this case, the air temperature changes due to the opening and closing of a special tap (VAZ heater tap), which reduces or increases the flow of heated coolant entering the heater radiator.

You can control the crane thanks to the presence of a regulator in the cabin, which is connected to the crane using a flexible rod. The air flow into the cabin is supplied by the heater fan, and the intensity of the supply will depend on the rotation speed. The VAZ 2107 heater motor is responsible for the operation of the fan. The fan rotation speed changes due to the use of a resistor.

By the way, if the car is moving at high speed, the heating system can supply air to the cabin even when the VAZ 2107 heater fan is turned off. The fact is that the air flow from outside is capable of creating pressure in the air supply box, due to which heated air penetrates into the cabin.

The heating system itself is simple. Air ducts can direct heated air to the feet, the driver, the windshield and side windows, etc. You can control the stove, change the temperature, and select the blowing direction using the knobs on the dashboard.

The handle at the top is responsible for adjusting the position of the heater tap. By moving the handle as far as possible to the left, the tap closes completely, and to the right will mean full opening.

The middle handle changes the position of the air supply cover, which allows you to adjust the intensity of the hot air supply. The handle on the bottom allows you to control the dampers of the heated glass air ducts. If you move the handle to the right, the air flow goes to the side windows, while the left position allows you to blow the windshield.

Sequence of actions when replacing the Lada Granta heater radiator

Note to the driver!

There are two ways to dismantle the heater radiator on a Lada Grant: according to the instruction manual and the “folk method”. Let's look at each with a specific example.

We place the car within the perimeter of the repair area, turn off the engine, and open the hood. We provide priority safety measures.
After the engine has cooled down, we proceed to dismantling the heating system on the Lada Grant without a condenser.

Modification of the VAZ 2107 stove: heater tuning

Although the design of the VAZ 2107 stove is simple, however, the design is not without drawbacks. For this reason, many owners modify the VAZ 2107 stove with their own hands or carry out repairs, change worn out elements, etc.

As a rule, the list of improvements includes improvements in terms of increasing the tightness of air ducts (often in those places where there are connections). This solution makes it possible to achieve more efficient heating of the interior space and blowing of the windows.

The fan of the VAZ 2107 stove is also often replaced, when the standard fan is replaced with a powerful analogue from other VAZ models. The fan of the VAZ 2108 stove is suitable for replacement. Also, the electric motor (motor) of the fan 2107 is mounted on plastic bushings, the bushings wear out, the shaft begins to play, and noise, hum or whistle is heard during operation.

Replacing it with the VAZ 2108 version, which already has bearings, solves this problem too. To replace the VAZ 2107 stove fan, you need to prepare a fuse, a resistor and a speed switch. The parts fit from the Niva and Kalina models.

To remove the fan you need two screwdrivers (flat and Phillips), a 7 and 10 wrench, and pliers. To get to the fan, the instrument panel, shelf, and glove box are removed. Then, using key 7, loosen the casing of the air damper adjustment cable. Next, the cable loop is thrown off the lever.

Now, using key 10, the nut securing the heater body is unscrewed, after which the air ducts (left and right) are removed from the heater body with a flat screwdriver. Then, using the same flat screwdriver, you need to remove the latches that secure the fan.

Next you need to disconnect the wire terminals, remove the fan from the stove body, and remove the impeller. Taking into account the fact that the fan from the VAZ 2108 is slightly larger in size, changes are being made to the design of the stove.

Replacing only the motor requires making an additional hole in the grille through which hot air passes down. If you do not make a hole, the electric motor housing will rest against the grille.

If you need to change the stove housing in order to install a 2108 fan on the “seven”, then you need a new housing, which is usually made of plexiglass. During manufacturing, all dimensions must be accurately maintained, since errors will cause vibrations and the new fan will break. After assembling the body, all joints are coated with sealant.

The main thing is to take into account when reassembling and installing that the air is taken from outside and not from the passenger compartment. Also, if air does not flow into the “sleeves” or the stove blows under the panel, you should check the fastenings of the air ducts. It often happens that the air duct simply does not fit into place, is clogged with foam rubber, etc.

The air ducts themselves are also being improved. This is done by making additional holes in the stove body, into which several plumbing hoses are then inserted. If these hoses are connected to the side air ducts, as well as the bottom ones, then this will create a more powerful flow of warm air when blowing the legs or windows.

Review of Manufacturer Prices

Heater parameters: weight 0.5 kg, length 155 x width 167 x height 20 mm.

Name/article	Price, rub.)
Heater radiator 2190-8101060	From 2400
21900-8101060-00	—/—
21900-8101060-10	—/—
27140-5PA0A	—/—
LUZAR aluminum LRh 0190b	From 2100 – 2200
LUZAR LRaC 0190	—/—
LUZAR 482768	—/—
LUZAR 353287	—/—
AvtoVAZ OJSC 429612	From 2300
with air conditioning for automatic transmission LUZAR 367792	From 2400
AvtoVAZ OJSC 348402	—/—
LUZAR 466443	—/—

The VAZ 2107 stove does not work: reasons

Taking into account the fact that there can be quite a lot of heater malfunctions, we will consider the main ones below:

First of all, air in the cooling system causes the stove to not work. In this case, it is important to remove the air plug, that is, to perform high-quality de-airing of the engine cooling system.
The heater may not work well because the radiator of the VAZ 2107 heater is clogged. As a result, the coolant does not circulate well through the heater system, and the air warms up poorly. It turns out that when the heater on a VAZ 2107 does not work completely, that is, it blows, but the air is cold, this often indicates that the radiator is completely clogged and needs to be washed or replaced. To quickly determine this, you need to feel the pipes. If the inlet pipe is warm and the outlet pipe is cold, then the problem is obvious.
It also happens that the heater valve is open, but no coolant is supplied to the radiator.
This usually happens because scale and dirt have accumulated in the system, and the tap is clogged. To solve the problem, the faucet must be removed for cleaning or replacement. Often the culprit that causes the heater to work poorly is the pump (water pump of the engine cooling system). As a rule, pump problems can lead to the fact that not only the heater does not work, but also the engine does not cool, which leads to overheating of the engine. The pump may not work as a result of a broken generator belt, as well as the reason for the destruction of the impeller, jammed bearings, etc.
in some cases, a displacement of the partition in the radiator can be noted. In this case, both the inlet and outlet pipes of the radiator will be hot, but no air will flow into the cabin. In this case, there is a high probability that the partition has shifted and the radiator needs to be replaced.
in a situation where an oily coating is found on the car windows or an oily liquid is visible on the floor, this is the result of an antifreeze or antifreeze leak. Coolant may flow in the area of the pipes, in the area of the radiator tap, etc. The taps and pipes must be replaced, the stove radiator can be soldered. You can also use a cooling system sealant, however, soldering and sealant is a temporary measure. It is optimal to replace the radiator immediately.

What to install?

Brand Pekar

Heating radiators used for the VAZ 2110 are usually divided into two types:

Old style;
New sample.

Until the fall of 2003, old radiators were installed on the “tenth” model, and then cars with new units began to be offered. There is practically no difference between them, but the repair differs in approach and complexity.

In addition to the standard aluminum radiator, a copper analogue is perfect for the VAZ 2110. This unit has fewer fins, but is characterized by more efficient heat transfer. This will make the stove work much better. The only drawback of a copper radiator is its cost. Ideal for installation on a VAZ 2110, a double-row copper radiator marked 2110-8101060 will cost you up to 2,000 rubles.

If you don’t want to spend that kind of money, but want to get an effective device with high quality indicators, then choose the DAAZ model. This radiator is made of aluminum, works well, and the price does not exceed 1000 rubles.

Repair of VAZ 2107 stove

First of all, it is important to immediately identify the breakdown. If the problem is a leaking pipe, faucet or air lock, this problem can be solved quickly.

If the cause is the heater radiator or other hard-to-reach elements, then a larger amount of work is expected, that is, you need to separately study the instructions on how to remove the VAZ 2107 heater and how to replace the VAZ 2107 heater. Let's look at methods for eliminating common faults.

If the heater in the car does not turn off in the summer, although cold air is set on the control unit, then the faucet or the faucet drive cable is faulty. The valve is located under the dashboard on the passenger side. You can first try to tighten the tap by hand, but you should not use much force, otherwise the tap will break and antifreeze will flow into the cabin.

If the problem is with the faucet, it is optimal to immediately replace it with a new one. To do this, a pipe is disconnected under the hood that goes to the tap. To prevent some of the coolant from pouring into the engine compartment after removal, a container is placed under the pipe. Then the storage shelf is removed, then, using wrench 10, the nuts securing the faucet to the stove body are unscrewed. Now the tap can be removed from the studs and a new one installed.

As a rule, the heater tap needs to be changed if it gets stuck, etc. In this case, it is better to install a ceramic faucet instead of a standard metal one. Such a faucet, unlike its factory counterpart, does not become sour, scale does not accumulate on the ceramics, and corrosion does not occur. As a result, even if the tap is closed for a long time (for example, from spring to autumn), after opening it, full functionality remains.

Radiator malfunctions are more serious failures. If the heater radiator is leaking or clogged, it must be removed. The same can be said about the stove fan, motor, etc. To carry out such repairs, you need to know how to remove the 2107 stove.

In short, to get to the radiator, you need to unscrew the radiator pipes. Taking into account the leaking antifreeze, you will need to replace the container. If you need to remove the stove fan, you do not need to touch the cooling system itself. In fact, removing the VAZ 2107 stove can be divided into two stages:

dismantling elements in the cabin;
removing elements under the hood;

Above we looked at how to remove the stove body in the cabin. Now let's look at the engine compartment. First, you need to remove all the clamps that secure the tubes and hoses of the heater valve, then remove the hoses. After using the 7 head, unscrew the fasteners of the stove seal, then remove the seal from the pipes. To remove the radiator, first remove the casing of the valve adjustment cable and remove the loop from the lever.

Now, using a 10mm wrench, unscrew the 2 mounting bolts, remove the pipe from the radiator, and simultaneously dismantle the tap. Please note that there are rubber seals between the pipe and the radiator. So, they need to be replaced with new ones during reassembly.

If the radiator is clogged, flushing the stove radiator involves removing it, cleaning it from the outside, washing it from the inside, and blowing it with a compressor. The previously removed pipes, heater valve and other system elements are also cleaned.

We also recommend reading the article about why antifreeze or antifreeze bubbles in the expansion tank. From this article you will learn about the reasons for bubbling in the expansion tank of the engine cooling system, what problems the bubbling indicates, etc.

The inside of the pipe can be cleaned with a brush. The radiator is washed out by Karcher under a pressure of about 5 atmospheres. You need to wash until clean water free of dirt and impurities flows out of the radiator.

If there is no Karcher, you can flush the radiator with caustic soda. It is enough to prepare a solution of soda, pour it into the radiator and leave for 60 minutes. Then the solution must be drained and the degree of contamination of the drained liquid must be assessed. The washing is repeated until the drained solution becomes clean. At the end, the stove radiator must be dried by blowing it with a compressor.

Let us also add that if the radiator is leaking and soldering is needed, then such an element can be disassembled by unsoldering its upper part and bottom. To do this, you need to heat the part with a gas burner. After it is possible to remove the upper and lower parts, the insides are cleaned mechanically (using an iron mesh) or a washing liquid is used (alkaline solution, acid solutions). After this, the radiator needs to be soldered.

As practice shows, the VAZ 2107 stove heats poorly not only due to leaks or problems with the radiator or tap. You can also highlight malfunctions in the operation of the fan mode switch, failure of the wiring of the control unit, oxidation of contacts, etc. For example, the motor of the VAZ 2107 stove may be problematic. As mentioned above, if a whistle appears, then the electric motor needs to be cleaned and lubricated (a temporary solution) or replaced with a new one, and it is better to install a more reliable option with bearings.

Let's move on. The control unit for the VAZ 2107 stove is controlled by levers on the instrument panel, which are connected to the actuators using flexible rods. Moreover, it is thanks to this solution that the degree of opening of the air dampers is regulated, the heater valve opens and closes, air flows are redistributed and blowing zones are selected.

There is also a lower damper called the air distribution cover. This damper is controlled by a special lever, which is located on the driver's side under the dashboard.

So, the rods mentioned above are a metal wire, which over time can stretch, burst, jump off, etc. It is not difficult to guess that broken heater cables and other problems with the dampers also cause the heater to not work correctly. In this case, the stove also needs to be disassembled and repaired.