Features of removing and replacing the thermostat on VAZ 2108, 2109, 21099 cars

How to check and replace the VAZ-2109 thermostat (8 or 16 valves)? This procedure is not very complicated, and even a less experienced car owner can handle it without much difficulty. What needs to be done is described in this article.

The thermostat itself is a mechanical device whose operation is based on purely physical principles. Inside it is wax that is sensitive to temperature changes. When the coolant heats up, the substance melts and, as a result, the damper opens, allowing it to enter the cooling system.

Features of removing and replacing the thermostat on VAZ 2108, 2109, 21099 cars

The service life of the thermostat for the engine cooling system of VAZ 2108, 2109, 21099 cars is 50-60 thousand kilometers. This is the best case scenario. It happens that it has to be changed much more often. Let's look at how to quickly and cost-effectively replace a thermostat.

Necessary spare parts, tools and accessories

— New thermostat
For the cooling system of engines 2108, 21081, 21083 (thermostat 2108-1306010-10 or 2112-1306010).

Thermostat 2108

— Four clamps for pipes

In case the old ones are no longer suitable or there are doubts about their ability to properly compress the pipes.

— Phillips screwdriver or 7 mm wrench

Preparatory work

On engines of VAZ 2108, 2109, 21099 cars, access to the thermostat for replacing it is quite good. The only problem is that it is necessary to drain the coolant, which is a labor-intensive task in the presence of engine mudguards and a sump protection sheet.

Therefore, we will drain the liquid from the Solex carburetor heating block.

We remove the long hose from it (by loosening the clamp) and drain the liquid into a container with a volume of at least four liters (or several plastic bottles). The coolant level in the engine cooling system will drop well below the thermostat and it can be quickly removed and replaced with a new one.

Replacing the thermostat of the engine cooling system of VAZ 2108, 2109, 21099 cars

— Loosen the four thermostat clamps

We do this using a Phillips screwdriver or a wrench.

— Remove the old thermostat

— Installing a new thermostat

Before installation, wipe the pipes going to the thermostat dry. If there is old sealant, carefully remove it. We install the new thermostat without sealant. Since its pieces that come off can clog the channels of the cooling system (and this impairs the coolant circulation and overheats the engine). If necessary, change the clamps on the pipes.

— Add coolant to normal level

We start the engine and expel any air pockets from the system, check the operation of the engine cooling system with a new thermostat (the first and second circles of the cooling system should gradually warm up in turn, and then the fan on the radiator should turn on).

Notes and additions

— Installing a new thermostat is a reason to simultaneously check the condition of the cooling system pipes, the cleanliness of the expansion tank plug, and the fastening of the clamps.

Reasons to install a thermostat from “ten”

Features of installing the camshaft on the engine 2108, 21081, 21083 of VAZ 2108, 2109, 21099 cars

The 6-hole unit has been modified, when compared with the device installed in the “nine”, its advantages over the 5-hole version from 2109 are as follows:

The device from the “ten” is 5 cm shorter than the standard version of the “nine”, so there will be more space under the hood.
A more modern 6-hole thermostat works more stably, as a result, the temperature remains unchanged.
In the event of a breakdown, you do not have to change the entire device, since it is dismountable, and if necessary, you can only change the thermoelement.
When servicing, you won’t have to struggle with a large number of clamps, since the 6-hole version is secured with a rubber tube.
It should be noted that until 2003, VAZ 2110s were also equipped with a device with five holes, so you need to buy a version from later releases.

Checking and replacing the thermostat of a VAZ-2109 car

If the engine overheats while running or is slow to reach operating temperature, you need to check the thermostat.

To check the thermostat on your car, start the engine and touch the lower radiator hose with your hand. It should be cold.

After the coolant temperature reaches 87–92 °C, the hose should begin to heat up. If this does not happen, you need to remove the thermostat and check its functionality.

Unscrew the bolts securing the crankcase protection and remove it.

Unscrew the expansion tank cap.

Place a container under the drain hole, unscrew the cylinder block drain plug and drain the coolant from the cylinder block.

Place a container under the drain hole, unscrew the radiator drain plug and drain the coolant from the radiator

Loosen the clamps

Disconnect the three hoses from the thermostat housing.

Loosen the clamp and remove the thermostat with the hose.

Then disconnect the short hose from the thermostat.

Lower the thermostat into water heated to 78–80°C.

Heat the water, stirring it constantly, to (87±2)°C.

At a temperature of (87±2)°C, the main thermostat valve should begin to open.

If this does not happen, replace the thermostat. Install the thermostat in the reverse order of removal.

How is the check carried out?

First of all, it is worth pointing out that on a VAZ-2109 (with an 8-valve engine, as well as a 16-valve engine) you do not need to drain the coolant to check. The procedure is:

start the engine;
check the temperature of the lower pipe leaving the radiator.

Normally, it should remain cold, since the liquid circulates only in a small circuit. It heats up gradually. As the coolant reaches a temperature ranging from 87 to 92 degrees and the wax in the thermostat melts, the damper opens and a large circle begins to operate. If this does not happen, then the thermostat will have to be changed.

Before buying a new one, check whether the old one is really damaged. This is not difficult to do, just put the device in a pan of water (on a rag) and heat it to 87-90 degrees. A working device will open the main valve.

Replacing the thermostat on a VAZ 2114 (2110, 2109, Kalina) 8 valves

Replacing the thermostat on VAZ 2114, Kalina, etc. cars, in my opinion, is an average, difficult job and can be done at home with your own hands. To make it easier for you to cope with it, I decided to fully describe the whole process using my own example with pictures.

When and in what cases should you change the thermostat?

Basically, the thermostat needs to be changed when it stops performing its function (this is logical) - namely, it jams or just starts to jam in one of the positions. It has only 2 positions - open and closed. Initially, while the engine is still cold, the thermostat is in the closed position, i.e. The coolant circulates only in a small circle (cooling jacket of the engine block). Upon reaching a certain temperature (80-90 degrees), the thermostat opens and allows antifreeze (antifreeze) to circulate in a large circle (through the cooling radiator).

If the thermostat is stuck in the closed position, hot fluid will not enter the radiator and the engine will overheat. If it is open, on the contrary, the liquid will constantly circulate in a large circle and the engine will be very strong! It takes a long time to warm up, which is also not very good.

Based on this, we can conclude that a stuck thermostat needs to be replaced.

How to change the thermostat on a VAZ 2114

As you already understood, I will show replacing the thermostat using the example of a VAZ 2114, 2110, Kalina, etc. with 8 valve engines.

To make the work easier, you will need to remove the air filter and its corrugation.

The first thing to do is drain the antifreeze (antifreeze) from the engine block. To do this, there is a good way to quickly drain antifreeze (antifreeze). You need to remove one of the throttle valve heating pipes and direct its end into some container.

Next, you need to remove the overflow hose from the expansion tank and plug the holes on the hose itself and the tank fitting with something.

Now, in order to force the liquid to flow into the substituted container, you also need to clog the fitting of the removed hose from the throttle valve with something, for example, with your finger, and blow into the expansion tank with your mouth (you can use a compressor, but for this you need another tank cap with an embedded fitting for the compressor).

If everything is done correctly, the liquid will begin to flow. You need to drain until it stops leaking (in my case it came out to about 3.5 liters).

After draining the liquid, you can begin to remove the thermostat itself. The first thing you need to do is remove all the incoming and outgoing pipes and hoses (5 pieces in total). Also remove the terminal from the coolant temperature sensor.

The thermostat on the VAZ is secured with 2 nuts diagonally. It's time to unscrew them. The mass from the battery is also screwed to the top stud.

The thermostat installation site must be cleaned of dirt and adhered parts of the old gasket.

The VAZ 2114 (Kalina) thermostat itself consists of 2 parts. We will change the upper part, since this is where the valve is installed. It is secured with 3 hex bolts.

Please note that PRAMO thermostats cannot be installed instead of thermostats from AvtoVAZ, since the PRAMO thermostats have a crescent-shaped side that will prevent this from happening. But the side can be cut down and then everything is installed as expected.

Before replacing the thermostat, do not forget to install a new rubber O-ring, it should be included in the kit.

We connect the two halves of the thermostat together and tighten the bolts well. You need to connect in the same way (same side) as it was, since otherwise you will not be able to connect the pipes (the fittings will “look” in other directions).

Instead of the old gasket, naturally, you need to install a new one; it is better to choose a paranite gasket rather than a paper one. In my case, there will only be sealant, since I did not buy a gasket :( Therefore, I cleaned the surface of the thermostat and the surface of the thermostat mounting on the engine, applied a thin layer of white sealant - the gasket, waited 20 minutes (following the instructions) and installed the thermostat in place.

Removing and replacing the thermostat on VAZ 2108, 2109, 21099

Hello, from this article you will learn how to determine whether the thermostat is working and how to independently replace the thermostat on VAZ 2108, 2109, 21099 cars . The thermostat must open when the engine warms up, so that the coolant flows in the so-called “great circle” through the radiator, thereby better cooling the engine. The first sign of thermostat failure is the engine boiling. That is, if your antifreeze level in the expansion tank is normal, but the engine still heats up more than 90 degrees, then most likely the thermostat has failed. You can also feel the lower radiator hose; at first it should be cold, and then it should heat up sharply when the thermostat opens; if the hose does not heat up even when the engine is heated to operating temperature, then it is jammed and needs to be replaced. It is also possible that the thermostat is stuck in the open position, then the engine, on the contrary, will not heat up, or will do so very, very slowly. Before you start changing the thermostat, drain the coolant from the system. Now use a screwdriver to unscrew the clamps on the hoses that are connected to the thermostat (it is located to the left of the engine) and then remove all the hoses one by one

Next, remove the thermostat itself

We install a new thermostat, connect all the hoses to it, fill in coolant and check the functionality of the new thermostat. Also watch the video on removing and replacing the thermostat on a VAZ 2108, 2109, 21099:

Replacing the thermostat on a VAZ 2109

To remove and install the thermostat on a VAZ 2109 with a carburetor engine, it is necessary to drain the coolant from the cooling system; the figure below shows how to drain the coolant:

1 — radiator drain plug, 2 — thermostat, 3 — hose to the pump inlet pipe, 4 — hose to the expansion tank, 5 — lower radiator hose (outlet)

Before removing the thermostat from the VAZ 2109, it should be checked - this is done if the engine overheats during operation or slowly warms up to operating temperature. To check the thermostat on a VAZ 2109 car, start the engine and touch the lower radiator hose with your hand. It should be cold. After the coolant temperature reaches 87–92 °C, the hose should begin to heat up. If this does not happen, you need to remove the thermostat and check its functionality.

Thermostat design VAZ 2109: 1 – inlet pipe from the radiator, 2 – rubber insert, 3 – solid heat-sensitive filler, 4 – bypass valve spring, 5 – inlet pipe from the engine, 6 – bypass valve, 7 – outlet pipe to the pump, 8 – main valve spring, 9 – main valve, 10 – pipe from the expansion tank, 11 – piston.

Replacing the thermostat VAZ 2109 with carburetor

Unscrew the bolts securing the crankcase protection and remove it

Unscrew the expansion tank cap

Unscrew the cylinder block drain plug and drain the coolant from the cylinder block

Unscrew the radiator drain plug and drain the coolant from the radiator

Loosen the clamps

Disconnect the three hoses from the thermostat housing

Loosen the clamp and remove the VAZ 2109 thermostat with the hose. Then disconnect the short hose from the thermostat

Lower the thermostat into water heated to 78–80 °C. Heat the water, stirring it constantly, to (87±2) °C

At a temperature of (87±2) °C, the main thermostat valve should begin to open. If this does not happen, replace the thermostat. Install the thermostat on a VAZ 2109 in the reverse order of removal. After installation, fill in coolant. This completes checking and replacing the thermostat.

Preparing for replacement

In order for the car to be completely ready to replace the thermostat, you need to wait until the engine cools down to at least 40-50 degrees. It is extremely dangerous to work while it is hot; you can get burned. The thermostat on a VAZ-2109 is replaced quite quickly; the most difficult and tedious procedure is emptying the system. To do this, you need to use two drain holes, which are located in the lower part of the radiator (the plug is unscrewed by hand) and in the engine block (head bolt 13).

But what should you do if the system is filled with antifreeze, which is quite expensive? We must try to preserve it so that it is not expensive to repair the car. To do this, first of all, by opening the stove tap, unscrew the clamp on the pipe that goes to the throttle valve. It is necessary to drain the maximum possible amount of antifreeze through it. Yes, this procedure is slow, but it will save almost all the liquid. Only after this can you unscrew the plug on the radiator and on the engine block. And don’t forget to unscrew the cap on the expansion tank to increase the pressure.

How to check the thermostat of a VAZ 2109 injector

How to replace the thermostat on a VAZ-2109 with an 8 or 16 valve engine?

This operation should not cause difficulties, and any car owner should be able to handle it, regardless of his experience in the field of car repair. What actions need to be performed are described in this article. The thermostat is a mechanical unit; its operation is based on physical rules. Inside it is wax, which is sensitive to temperature changes. When the coolant is heated, the wax melts and a damper opens, allowing coolant to enter the system, where it is cooled.

Thermostat design VAZ 2109: 1 – inlet pipe from the radiator, 2 – rubber insert, 3 – solid heat-sensitive filler, 4 – bypass valve spring, 5 – inlet pipe from the engine, 6 – bypass valve, 7 – outlet pipe to the pump, 8 – main valve spring, 9 – main valve, 10 – pipe from the expansion tank, 11 – piston.

From the VAZ-2109 to the modern Granta model, thermostats perform their function adhering to one principle, and they are interchangeable with each other. The new unit is smaller in size than the old VAZ models; this fact will not interfere with installing the part from the old VAZ model.

To make the stove heat better, a thermostat from the new VAZ model is installed for this purpose.

What is better than a thermostat with “ten”?

Of course, we are not talking about the models that were included in the first “ten” releases. The VAZ-2109 thermostat (carburetor) is very similar to the one that was installed in the first “ten” models. But now we are talking about more modern models. Their main advantage is that the number of clamps is reduced to a minimum. But the thermostat is not attached to the engine block using a short pipe. The housing is screwed to the engine block using two studs. The temperature sensor is screwed into the thermostat, therefore, the second hole must be plugged.

In addition, when installing the thermostat from “ten” to “nine”, it becomes possible to save a little, because you can only change the sensitive element. Passive benefits include freeing up space under the hood. The thermostat housing becomes five centimeters shorter, which makes it possible to easily reach, for example, the adjusting nuts of the clutch cable.

Symptoms of a thermostat malfunction on a VAZ 2109

The correct operation of the thermostat is indicated by:

the need for a long period of time for the engine to operate at the desired operating temperature;
rapid engine overheating;
to increased coolant temperature.

Due to exceeding temperature standards, it is usually necessary to repair the internal combustion engine. To avoid this factor, you should replace the thermostat as soon as possible.

Symptoms of malfunction

The following indicates that the thermostat is not working properly:

the long period required for the motor to reach operating temperature;
rapid overheating of the power plant;
high coolant temperature.

It is the systemic excess of temperature standards that, as a rule, leads to breakdown of the entire engine. For this reason, it is necessary to replace it at the first sign of a thermostat malfunction.

How to check the VAZ-2109 thermostat? Replacing the VAZ-2109 thermostat

What is a VAZ-2109 thermostat, when is it necessary to replace it, what are the main signs of failure, we will tell you in this article. Our publication also contains a detailed description of how to install a more advanced thermostat from a model 2110 car. Its advantages will be discussed a little below. And it’s worth starting with theory; you need to understand what kind of device the thermostat has, what functions it performs in the cooling system of an internal combustion engine.

What is a thermostat?
Signs of breakdown
Preparing for replacement
Replacing the thermostat
What is better than a thermostat with “ten”?
Is it possible to install a thermostat 2110 on “nine”?
Refilling the cooling system
Conclusion

What is a thermostat?

As the name of the device suggests, it does something with temperature. More specifically, it helps switch fluid flows in the cooling system. Moreover, the thermostat, carburetor or injector are at the heart of the gasoline injection system and have the same composition and housing design. When operating any engine, it is necessary to ensure heating of the throttle assembly. And it is present in any injection system: both in the carburetor and in the injector.

The basis of any thermostat is a special plate, which is made of a material called bimetal. It reacts to temperature changes and is capable of deformation because of this. The switching of air flows is based on this effect: the plate moves the valve, which is fixed by springs. Having overcome their force, the plate moves the valve, opening the path for liquid flow to the main radiator to ensure effective cooling.

Signs of breakdown

What could be the first sign that the VAZ-2109 thermostat is faulty? Of course, the engine overheats even when driving at a high constant speed. The reason is that the liquid continues to circulate in a small circle, not a drop gets into the radiator. And even turning on the electric fan won’t help, because doing so is simply useless. The only thing that can slightly correct the situation is opening the heater tap and turning on the interior airflow at maximum speed.

But such an action will not bring comfort in hot weather. The most common thermostat breakdown is the sensing element jamming in its original position (the liquid moves in a small circle). If this suddenly happens, then you need to try all methods of elimination. Even a few light blows to the body can open the valve. If such an emergency occurs on the road, you will have to drain the liquid and break all the insides of the thermostat so that the liquid circulates only in a large circle. But it won’t boil, and you can get to the repair site.

Preparing for replacement

Replacing the thermostat

Remove the old one, install a new one in its place - this is the entire replacement procedure. But you need to carefully inspect all the pipes of the system. The VAZ-2109 thermostat is connected. The injector or carburetor in the injection system does not matter.

When carrying out work, pay special attention to the clamps. It is highly undesirable to use old ones; it is better to install new ones. Moreover, reliability is an important criterion. Worm-type clamps are very delicate: as soon as you apply a little more force, it breaks. And the possibility of damaging the pipe is very high. If you tighten the clamp too much, you can puncture the rubber. But, of course, you can’t tighten it loosely, as liquid leaks will appear. In other words, this is a double-edged sword. And a little advice: before installation, it is advisable to apply a thin layer of sealant to the surface of the thermostat that will be in contact with the pipe.

What is better than a thermostat with “ten”?

Is it possible to install a thermostat 2110 on “nine”?

This question was partly answered in the previous paragraph. Yes, you can install a VAZ-2110 thermostat on a 2109, and it doesn’t matter at all whether the “nine” is carburetor or injection. In fact, starting from the “eight”, the engines are used the same. What can we say, even modern “Grants” are equipped with an engine that has been used on “eights” and “nines” since the 80s. Progress, to say the least. Of course, instead of a carburetor there is now a more modern injection system, which by European standards was outdated 5-10 years ago. And almost all components are interchangeable. There are minor differences and improvements, but this does not change the overall picture.

Refilling the cooling system

It will take you a few minutes to add fluid and bleed the cooling system. First of all, check that all pipes are securely installed and that all clamps are tightened. Then look to see if the engine block and radiator plugs are in place. If not, then install them. Now you can open the stove tap and pour liquid into the expansion tank. The gurgling stopped - they closed the plug and started the engine. Wait until it warms up to operating temperature - about 90 degrees. If necessary, add fluid to the reservoir. It is necessary that its level is between the lower and upper marks.

Conclusion

There is not a lot of work with the thermostat, but you know very well how to check the thermostat of the VAZ-2109. Place it in boiling water, if the valve opens, then the element is working. It cannot be repaired; only a complete replacement will help. If you want to improve the performance of your engine, then, of course, it makes more sense to mount a thermostat from the “tens”. True, minor difficulties may arise, for example, the motor will not gain temperature. In this case, it is worth reconsidering the connection of system elements. Otherwise, thanks to this modernization, heat transfer only improves.