Purpose
It is needed to control the temperature of the coolant circulating through it. How he does it? – It opens, releasing antifreeze through a large circuit of the cooling system and, when the temperature drops to a certain value, it closes.
In the closed position, the coolant moves in a small circle, bypassing the radiator. So it starts to heat up. Having reached a value, for example, VAZ 2101, the opening temperature of the thermostat is 80 degrees - it opens. In this case, the liquid flows through the main radiator and is cooled. Then it closes. This process occurs repeatedly throughout the engine's operation. This maintains the optimal temperature regime of the vehicle’s internal combustion engine.
Signs of a broken thermostat
There are a number of signs that clearly indicate that the thermostat is faulty:
- The light on the instrument panel is constantly on, indicating that the engine is overheating. This usually happens because the thermostat valve has closed and is stuck in that position;
- The engine warms up very poorly. This means that the thermostat valve does not close tightly. As a result, antifreeze flows through both the small and large cooling circles and cannot warm up in a timely manner;
- After the engine starts, the lower thermostat tube heats up literally within a minute. You can check this by simply placing your hand on the nozzle. This situation indicates that the thermostat valve is stuck in the fully open position.
If any of these symptoms are detected, the driver should replace the thermostat as soon as possible. If the car owner ignores the above symptoms, this will inevitably lead to overheating of the engine and its jamming. It is extremely difficult to restore an engine after such a breakdown.
What does it consist of
- Frame. It is made of stainless steel
- Main valve - circulates coolant through the radiator
- Small circuit valve - its name speaks for itself
- Spring. Due to the elastic force, it returns the valves to their original position, closing them
- Cylinder with technical wax and rod. The rod pushes the valves, opening them
How to replace a VAZ 2107 thermostat with your own hands - step-by-step instructions.
To replace you will need:
- new thermostat
- crosshead screwdriver
- clamps (if necessary)
- pipes (if necessary)
- coolant
- sealant (if necessary)
- The first step is to drain the coolant (only on a cold engine).
- we drive the car into the pit (the car must be strictly horizontal!),
- move the warm air supply lever to the right,
- unscrew and remove the expansion tank cap,
- unscrew the radiator filler cap,
- unscrew the drain plug on the cylinder block (place a container under the drain in advance!),
- unscrew the radiator drain plug (place a container under the drain in advance!),
- The remaining coolant can be drained by unfastening the belt securing the expansion tank and lifting it up.
- For convenience, you can remove the battery.
- Unscrew the old clamps and remove the thermostat.
- Next, install a new thermostat (if necessary, you can replace the pipes and clamps).
- Fill with coolant, test the new part (described above).
Cylinder with wax
It occupies an important place in the design. It contains wax, which expands when heated. There is a rubber coupling in the cylinder cavity, and the inner end of the rod is located inside. Its outer part is located outside the cylinder.
When wax is heated to a certain temperature, it expands. In domestic VAZ models it is 80 degrees. The coupling with the rod is squeezed out, resting against the body.
Which thermostats to choose for VAZ (Lada) 2101/2103/2106?
Last month, PartReview users preferred LUZAR. 60% of positive votes belong to this manufacturer.
Gates thermostats took second place – 20%.
Vernet closes the top three with 20% of the votes.
In the general rating of thermostats, which takes into account the opinions of owners of different brands and models of cars, these brands occupy the following positions:
- LUZAR received 7th place, PR score - 65. Data from 69 reviews and 220 votes are taken into account.
- Gates was ranked 10th with a PR score of 56 based on 69 reviews and 85 votes.
- Vernet - 6th place, and the PR score was 70. Data from 59 reviews and 181 votes are taken into account.
Springs
The design includes two springs. They help the valves “return” to their original position after the coolant has cooled, reliably isolating the two circulation circuits of the system from each other.
The thermostat itself is placed in a cylindrical housing with three pipes. Two are connected to different circulation circuits, the third to a water pump (pump).
Video showing how a thermostat works and is made:
Pay attention to the quality of thermostats
The auto mechanic explained that thermostats in our country are not of good quality, be it France or Russia, to say that they are not of good quality is to say nothing at all.
AURORA is especially guilty of quality. Therefore, in order not to install a obviously defective thermostat on a car, it must be checked for functionality.
To do this, you just need to immerse it in hot water. If the thermostat valve works, then you can safely install it on the car.
The thermostat VERGIN (France) was removed from the car and tested in hot water, and to our surprise, it turned out to be not working. Or rather, the valve worked, but very weakly.
I had to go to the store and change the thermostat for the third one. They checked it in hot water, it turned out to be working, they put it in its normal place, started the car, warmed it up, and everything became normal. As a result, through joint efforts the car was repaired.
True, we still had a suspicion about the pump, but we never got to it.
Thermostat operating principle
It is the same for all models, both for the domestic automobile industry and foreign-made cars. The difference is in the opening temperature of the thermostat and design features. For example, there are electric ones, where the opening temperature is regulated by a special heating element. Now we will talk only about mechanical ones installed in most cars.
In the initial position, the valve of the large circle is closed, only the small one is open. Coolant flows from the cylinder block into the housing. Through an open valve, it circulates along a small circuit - from the cylinder block and engine head, passes through the thermostat, pump and returns back to the engine.
When the opening temperature reaches 80 degrees, the wax in the cylinder expands. Squeezes out the movable rod, which rests against the body. Further heating of the antifreeze leads to a greater output of the rod from the cylinder. Since it has already rested against the body, it has nowhere else to move out; it pushes the cylinder itself in the opposite direction.
Remember, there are two valves attached to the wax cylinder. They begin to move with him. At the same time, the valve of the large circle opens slightly, and the small one closes. Circulation begins through two cooling circuits.
With a further increase in temperature, the rod extends to its full length. Which leads to the complete closure of the small circle valve and the opening of the large one. In this case, all the liquid “flows” through the radiator and returns to the engine.
The liquid cools, the wax contracts, and the rod is partially immersed deep into the cylinder. Due to the return springs, the valves try to return to their original position.
Replacing the thermostat on a VAZ 2101-VAZ 2107
The thermostat on a VAZ 2107 car is a mechanism by which the coolant temperature is maintained within certain limits.
If the thermostat on a VAZ 2107 fails, this leads to increased fuel consumption, reduced engine life, or even jamming. At the slightest sign of malfunction, it will need to be replaced with a VAZ 2107.
In the material we will consider in detail what this device is, why it is needed, and how to replace it.
The thermostat is located between the large and small circles of the engine cooling system. Structurally, the product has the form of a housing, inside of which there is a valve with a temperature-sensitive element. This valve switches the coolant flow in a small or large circle.
The coolant flow regulator is connected through pipes to the pump, engine and cooling radiator. At the moment the engine starts, when the antifreeze has not yet warmed up, the thermostat, or rather its valve, is in closed mode.
The coolant circulates through a pump and passes only through the cylinder block.
The liquid that is in the radiator does not take part in the cooling process of the engine, but until it heats up to 80-90 degrees.
It is important to know! The thermostat valve on the VAZ 2107 opens completely when the coolant temperature reaches 84-86 degrees.
When the set temperature is reached, the thermostat locking disc moves. As a result of the valve opening, liquid begins to circulate in a large circle, passing through the radiator.
When fluid circulates through the radiator, the cooling efficiency of the engine increases. As soon as the temperature of the liquid decreases, the valve closes and circulation occurs in a small circle.
The coolant temperature indicators are affected by the following indicators:
- motor operating mode;
- movement speed;
- outside air temperature.
The thermostat maintains the coolant in a certain temperature range. This, in turn, affects the functioning of the motor, for which constant temperature indicators are important.
In terms of design, all types of thermostats on the VAZ-2107 are practically no different. Structurally, they are a housing with a thermal valve located inside.
The design of the device has three holes that serve to connect hoses from the cooling system.
Such a simple mechanism as a thermostat has only three causes of possible malfunctions:
- The valve does not close, as a result of which the liquid constantly circulates in a small circle without passing through the radiator.
- The valve does not open completely, which reduces the cooling efficiency of the motor.
- The valve does not close. In this case, the antifreeze passes in a large circle through the radiator. This has a negative impact on the engine, as it does not reach the required operating temperature.
Before replacing a product, you need to make sure it is not working. Let's find out in more detail how to check the thermostat of a VAZ 2107. You can determine one of the above malfunctions in the following ways:
- If the valve is jammed and does not close, then after starting the engine you need to check whether the lower part of the radiator immediately heats up or not. If it happens right away, this indicates that the device is faulty.
- If the device is jammed and does not open, then the engine temperature will rise, which can lead to costly repairs.
- Valve wedging can be detected by the fact that the motor does not reach sufficient temperature for a long time.
Such procedures can be performed at home. You can buy a new thermostat and install it in place of the old one, thereby checking its performance.
Another reason for product failure is water poured into the system. If the water is frozen in the system, it is prohibited to start the engine.
To replace the thermostat on a VAZ 2107, or it is also called a thermostat, you will need to use a screwdriver. The replacement principle is as follows:
- Wait for the engine to cool down.
- Drain antifreeze from the system.
- Initially, use a wrench or screwdriver to loosen the fastening of the clamp connected to the radiator. Disconnect the hose. Loosen and disconnect the fastenings of the two remaining hoses (from the cylinder block and pump).
- Dismantle the device along with the hoses.
- Replace the product along with the hoses if necessary. If the hoses have obvious defects, it is recommended to replace them immediately.
- Put on new hoses, then install the thermostat in place and tighten the clamps well.
- Now you can fill the system up to the mark and close the radiator cap. After starting the engine, the fluid level will drop, so you will need to add antifreeze.
Finally, you need to check the quality of operation of the device.
What is the best thermostat to install on a VAZ 2107? Under the “seven” you can install a thermostat from a VAZ 2110 car, which is practically no different. But there is still a difference: such a sensor allows the coolant temperature to rise to 95 degrees. Sellers advise: “Install a temperature regulator from “ten”, and you won’t have any problems!”
After we finalize the thermostat, we will need to check and configure it.
Welcome! A thermostat is a thing thanks to which the engine can warm up very quickly, or for a very long time if the thermostat is removed from the cooling system (And this can be done by inserting instead a regular housing from a similar piece of hardware and connecting all three main pipes to it cooling system) then the liquid will immediately begin to run in a large circle, in the summer this is good, because the car will not really warm up, especially in traffic jams, but as soon as winter comes, such a problem that the car does not really warm up begins to manifest itself strongly, excess fuel consumption due to with this it appears (you have to warm up the car longer), more heavy loads are placed on the engine, since engines are not designed to operate for a long time in a cooled state, because of this, only troubles occur and it seems like such a small thing, but it can create so many problems your car and therefore, as soon as problems with cooling begin, we recommend immediately changing the thermostat and under no circumstances delay replacing it.
Note! To replace a thermostat in a classic, you will need a minimum set of tools, namely: A screwdriver (Although this also depends on how you attach the clamps to the connecting pipes; if they are bolted, then you will need a wrench, so take this into account right away) and a container in which you will have to drain the coolant (Without draining the coolant, it is not possible to replace the thermostat, it will have to be drained partially and therefore not all of it will pour out of the cooling system, but still buy 5 liters from the auto store of exactly the same liquid that is poured into the engine of your car, have to!
Tell me what model of box is shown in this video???
Read more: Station wagon Ford Focus Active Wagon 2019-2020
I have an Aveo T 250 1.6, through the diagnostic obd, I can see how the temperature rises to 55′ in 3 minutes from 20′ and it doesn’t switch to gas... although the temperature on the LPG is set to 40′! What could it be?
I like you for the test, but bro, in the summer, on the contrary, you need to be brighter or yellower! Wet asphalt, all that.. and in the winter, even cheap ones will cost a hundred dollars) it will still turn up the snowball brightness!
- Guiana
- iPad has already learned to write Full HD?
- Deeann
and chasing the hurricane of last year, no? They would post the full versions.
- Famin
- Just watch out for rust on this beautiful beastie, will probably be less of a problem in your hot climate though
