Tuning the thermostat VAZ 2108, VAZ 2109, VAZ 21099

Check and replacement

If the thermostat fails, it should be replaced immediately. It is impossible to say that the device has failed only on the basis of an initial check.

If the engine overheats during operation or does not warm up to operating temperatures quickly enough, the condition of the unit is checked. Based on the results obtained, replacement or repair is carried out.

The most effective way to check the thermostat is to remove it. The procedure is performed as follows:

Unscrew the crankcase protection mounting bolts, after which the protection must be removed and placed aside for a while.
Remove the cap from the expansion tank where the coolant is located.
Place a clean container under the drain hole (if you plan to pour the same coolant back into the system), unscrew the drain plug from the cylinder block and remove all coolant from the cylinder block.
Place a container under the drain hole of the cooling radiator, unscrew the plug and drain the antifreeze or antifreeze.
Loosen the clamps holding the hoses.
Disconnect the three hoses that are connected to your thermostat housing.
Loosen the tension on the clamps and remove the thermostat along with the hose. The short hose is disconnected from the thermostat.
Place the dismantled device in a container of water, which must be preheated to 78-80 degrees Celsius.
Start heating the water, stirring the liquid occasionally. The water needs to be heated to approximately 87 degrees Celsius.
If the thermostat is working properly, when the temperature reaches 87 degrees with an error of plus or minus 2 degrees, the main valve should open. If this does not happen, the device is faulty and requires replacement.

Replacement process
To replace the thermostat, it is enough to remove the old one in accordance with the specified dismantling instructions, and reassemble the unit with an already working device in the reverse order.

What to choose?

Many owners of a VAZ 2109 with a carburetor complain that the factory thermostat is insufficiently efficient. Because of this, especially in winter, you have to suffer from slow heating, when it is difficult to achieve even 60 degrees.

To solve this problem, it is recommended to install a thermostat from an injection VAZ 2110 with 8 valves for the winter and for the entire period of operation of the nine. This is an improved element that has obvious advantages compared to the original thermostat for the carburetor VAZ 2109.

You should install an injection thermostat starting from tens, taking into account the fact that we are not talking about the first versions of the VAZ 2110, but later, modernized ones.
On 8-valve engines, dozens of thermostats have become dismountable, unlike the 16-valve VAZ 2110 and those devices that were initially installed from the factory on the VAZ 2109. This allows, in the event of a unit breakdown, to disassemble it and partially repair it without completely replacing the device.
To repair a new thermostat, borrowed from a VAZ 2110 with an injector and 8 valves, it is often enough to disassemble the device and replace the thermoelement there.
The new unit turned out to be 50 millimeters shorter, which allows for more free space.
The new element has lost many of the clamps that are relevant for thermostats from the VAZ 2109.
The component has undergone quite a serious modification, which allows it to effectively maintain a stable temperature inside the engine cooling system.

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.

Self-replacement of the VAZ-2109 thermostat

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.

From the VAZ-2109 to the relatively new Granta, thermostats work exactly the same, and moreover, they are interchangeable. True, the new units are somewhat shorter than the old ones, but this in no way prevents them from being installed.

Often, from the above-mentioned more modern model, a thermostat is installed if the stove does not “fry” too much.

Car thermostat VAZ 2109: purpose, principle of operation, fault diagnosis

A car thermostat is a device that maintains the best temperature for smooth engine operation. The thermostat is located in the engine cooling system. You can imagine with horror what will happen to the engine if the thermostat fails. Experts will help us understand the operating principles and troubleshooting of the VAZ 2109 car thermostat.

The operating principle of the VAZ 2109 thermostat.

If the engine cooling system has not yet warmed up, then the VAZ 2109 thermostat blocks the movement of coolant, which rushes into the radiator. The liquid moves in a small circle. If the engine overheats, the thermostat acts differently. It opens. Hot antifreeze enters the radiator and cools.

For example, engine overheating can be observed in traffic jams. When the car breaks free, the thermostat helps to achieve the required temperature. The VAZ 2109 thermostat is a kind of opening or closing valve. The drive in this case will be the property of a substance that expands when heated. Most often, copper ceresite powder or alcohol-containing liquid is used.

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.

How to check the thermostat on VAZ 2115, 2114, 2113, 2109.

Hello. If in winter your car takes a very long time to warm up or the stove does not heat up, or maybe on the contrary, in the summer the car constantly overheats and boils? If you have one of these symptoms, you should check whether the thermostat on your car is working properly. Before checking the thermostat, you need to understand how it works.

The operating principle of the VAZ 2115, 2114, 2113, 2109 thermostat.

What does a thermostat consist of? Let's get a look!

The thermostat consists of a housing, a bypass valve, a main valve, a temperature sensing element (usually located near the main valve) and a spring.

How does the thermostat work on VAZ 2115, 2114, 2113, 2109.

When the car is not warmed up, the thermostat valve is closed, as in the photo. In this case, the coolant moves in a small circle, as in the photo below.

When the machine warms up to operating temperature (87-90 degrees), the temperature-sensitive element slowly begins to heat up, as a result of which the spring compresses, the main valve opens and the liquid flows in a large circle.

How to understand that the thermostat of the VAZ 2115, 2114, 2113, 2109 is faulty?

There are two reasons why you can understand that the thermostat on the VAZ 2115, 2114, 2113, 2109 is faulty:

The car does not warm up.
The car overheats and boils.

There are also two ways to check the thermostat:

Check the removed thermostat for functionality.
Check the thermostat without removing it from the car.

Let's take a closer look at each of the options.

How to check the removed thermostat of a VAZ 2115, 2114, 2113, 2109 for functionality?

In theory, everything is simple. Take a pan with cold water, a thermometer up to at least one hundred degrees and a thermostat. We put it all on the tile to warm up and wait... We wait until the water temperature reaches 85 degrees, at which point we begin to look at the main thermostat valve. At 87 degrees it should open. If it does not open or opened earlier, then the thermostat is faulty.

How to check the thermostat of VAZ 2115, 2114, 2113, 2109 without removing it from the car?

A prerequisite in this case is that the car must be cold. After starting the engine, grab the lower pipe coming from the radiator with your hands. Until the temperature reaches 80 degrees it should be completely cold. When it reaches 85 degrees, the tube should begin to warm up slowly. And when 90 degrees is reached, full circulation of hot coolant should begin (i.e. the valve is completely open). The lower tube should be hot.

It happens that immediately after starting the engine, when it has warmed up only 50 degrees, warm liquid begins to flow through the lower tube. This shouldn't happen either. This means that the valve is constantly open.

I hope my article helped you solve your problem. If you have any questions, leave them in the comments and I will definitely answer them.

Dismantling

If it becomes necessary to remove the thermostat, then it will not be possible to do without draining the coolant. Some craftsmen claim that they were able to avoid the above procedure, but in reality it turns out that this option requires much more labor and still leads to the loss of 3 out of 5 liters of liquid. Therefore, it is better not to suffer and do everything as it should be. To do this, unscrew the plug located at the bottom of the radiator and drain the coolant into a suitable container. Then:

remove the air filter;
loosen the clamps holding the hoses;
disconnect the mass from the thermostat;
Unscrew the nut and pin holding the device.

Installing a New Thermostat

Before installing a working device, it is necessary to clean its location from dirt and rust. Apply a thin, even layer of any neutral sealant to the degreased surface. You should wait at least 10 minutes for it to dry slightly. After this, a new node is installed.

In the end, all that remains is to pour the required amount of coolant into the system, making sure that no air pockets form.

To make sure that everything is functioning normally, you need to start the power plant and inspect all connections for leaks. If detected, the latter are eliminated by tightening the fastening clamps.

In the vast majority of cases, after replacing the old thermostat, all unpleasant symptoms disappear for a long time.

The video below shows the replacement process in detail:

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.

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

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.

Thermostat diagnostics

It should be clarified that on a VAZ-2109 with any engine modification, when checking, it is not necessary to drain the coolant from the cooling system.
This operation is performed according to the following algorithm:

the engine starts;
The temperature is checked at the lower pipe that comes out of the radiator.

If the system is working properly, it should be cold, since the coolant should circulate only through a small circuit. The coolant heats up over time. When the coolant reaches a temperature ranging from 87 to 92 degrees, the wax inside the thermostat melts and the damper opens, as a result of which the liquid begins to circulate in a large circle. If this does not happen, then the thermostat is not functioning correctly and should be replaced with a working one.

Attention! To make sure that the thermostat is really not working, it should be lowered using a rag into water, the temperature of which is from 87 to 90 degrees. For a working unit, the main valve will be open.

Checking the thermostat VAZ 2109

The thermostat of the VAZ 2109 car is designed to maintain the coolant temperature at an operating temperature of 90 degrees. The thermostat contains a thermoelement that operates at a temperature of 87 degrees. The VAZ 2109 thermostat regulates the circulation of coolant in the cooling system; As you know, the cooling system consists of two circuits: a small cooling circle and a large cooling circle. Small circle - coolant circulation bypasses the radiator of the cooling system: the pump drives coolant only through the cylinder head. A large circle is when, in addition to circulation through the engine cylinder block, fluid circulates through the radiator of the cooling system.

The principle of operation of the VAZ 2109 thermostat

In other words, the task of the VAZ 2109 thermostat is that the antifreeze temperature is less than 87 degrees, the large cooling circle is closed; the antifreeze temperature is 87 degrees or more, a large cooling circle opens. A large cooling circle is designed to prevent engine overheating; when the thermostat is open, antifreeze circulates through the radiator and cools.

Cooling system VAZ 2109

How can you check if the thermostat is working properly? If the VAZ 2109 overheats, or, on the contrary, takes too long to warm up, then checking the thermostat is mandatory. The main malfunctions of the VAZ 2109 thermostat are as follows: 1) Antifreeze circulates only in a small circle. That is, the thermostat does not open and does not release antifreeze into a large cooling circle. As a result, the engine overheats. 2) The circulation of antifreeze throughout a large cooling circle is constant. That is, the thermostat is constantly open and antifreeze always circulates in both large and small circles at the same time. In this case, the VAZ 2109 engine takes a long time to warm up and does not warm up to operating temperature. 1) If the VAZ 2109 engine overheats, then the thermostat is checked as follows. We warm up the VAZ 2109 engine to a temperature of 90 degrees and open the hood. We touch the radiator hoses of the cooling system: the hose from the engine to the radiator should be hot, the hose from the radiator to the thermostat should also be hot.

How to remove the thermostat on a VAZ 2109

If it is necessary to remove the thermostat, it is necessary to drain the coolant. There is a group of car enthusiasts who claim that they can avoid the above process, but in fact it turns out that this method requires much greater physical strength and leads to a decrease in 3 to 5 liters of coolant. Therefore, it is better not to come up with your own method and follow the instructions. To perform this operation, unscrew the plug located at the bottom of the radiator and drain the coolant into a container of suitable volume and size.

dismantle the air filter;
the clamps that perform the function of holding the hose are loosened;
the mass is disconnected from the thermostat;
the nut and pin that hold the assembly are unscrewed.

Installing a thermostat on a VAZ 2109

Installing a thermostat is not a complicated process that even a beginner can perform. But there are some nuances that are important to know.

Before installing a working device, you should clean the place where the device will be located from dirt and rust.
A thin, uniform layer of neutral sealant must be applied to the surface that has been degreased. The main condition is that no chemical reaction occurs with the coolant.
After applying the sealant, you must wait a period of time equal to 10 minutes for the sealant to dry.
After this procedure, you can install a new node.
When the thermostat is installed, pour the required amount of coolant into the system, making sure that no air lock occurs.
To check the functioning of the normal mode, start the engine and inspect all places for fluid leaks.
If liquid leaks are detected, liquidation work is carried out by tightening the fastening clamps.
In most situations, after replacing the old thermostat with a new one, all unpleasant symptoms associated with a malfunction of the thermostat unit go away for a short period of time.