If the car engine overheats or the antifreeze temperature does not reach operating temperature, the thermostat may be a possible cause of these malfunctions. There is no difference when replacing the thermostat on Lada cars (Granta, Kalina, Priora, Vesta, Largus, Niva or XRAY) with 8 and 16 valve engines, all actions are performed in the same way.
You will need : drain the coolant, prepare a flathead screwdriver, a Phillips screwdriver, a set of wrenches and silicone sealant.
Procedure:
- Remove the engine air filter housing by disconnecting the hose and the connector with the MAF wires.
- Loosen all thermostat hose clamps (their number may vary depending on the thermostat model).
- Remove the thermostat assembly by unscrewing the two screws securing it and removing the ground connector and the connector with wires from the temperature sensor.
The thermostat is installed in the reverse order, after first cleaning the seat from dirt and applying sealant. The whole process is also shown in the video:
Let us remind you that it is better to check it before installing the thermostat. If this is not the problem, check the cooling system according to the diagram.
As you know, modern cars use a special liquid to cool the power plant. The versatility of this option allows you to simultaneously provide interior heating in winter.
In order for this system to work properly, a special device called a thermostat is also installed in it. In another way, it is also called a coolant temperature regulator. One of its functions is to help the engine warm up as quickly as possible and maintain it in the required condition.
In this article we will talk about how the thermostat of a Grant car is converted to a higher response threshold (92 degrees). In addition, we will tell you about the principle of operation of this device and about possible problems that arise in it.
How does it work
Specifically in Grant, the thermostat is located between the power plant and the radiator. The main task of the unit in question is to prevent the circulation of antifreeze until the engine warms up to the required temperature. If the engine remains cold, the coolant does not move.
Ideally, the thermostat operates after the temperature of the power plant reaches 80-95 degrees. All this allows, among other things, to reduce the volume of emissions harmful to the environment and minimize engine wear.
By the way, checking the functionality of the thermostat is relatively easy. It must be placed in a container with boiling water. If the element is working properly, its valve will open approximately 20 millimeters.
general information
There are single-valve, two-stage and two-valve thermostats, as well as electronically controlled devices. Grants are equipped with thermostats Luzar LT0191 and Luzar LT0190 (costing from 450 rubles for the first, and from 800 rubles for the second), FENOX TS034E7 (costing from 800 rubles), VAZ-2123 (article 2123-1306010, cost from 650 rub.). It is worth mentioning such devices as VAZ-2101 GATES (article TH14580, cost - from 350 rubles), VAZ-2121 GATES (article TH15380, approximate cost - from 500 rubles), VAZ-2110 (article 21082-1306010, cost - from 600 rub.) and other devices. They are located between the engine and the radiator, but it should be noted that there are differences in the location of the thermostats on Grants with eight-valve and sixteen-valve engines.
Their main task is to prevent the movement of antifreeze through the radiator until the car engine warms up to the required temperatures. Accordingly, if the car engine does not warm up, then the coolant does not move in a large circle. Usually the thermostat is activated when the engine reaches a temperature of 80-95C. Among other things, the thermostat helps reduce the amount of harmful emissions released into the atmosphere and minimize engine wear.
The thermoelement located inside the device is made of brass, has a cylindrical shape and is filled with artificial wax. When the engine reaches a temperature of approximately 82C, this substance begins to melt, which causes it to expand. This sets the valve in motion, it opens, after which the antifreeze begins to circulate through the car’s radiator. Turning off the motor causes the wax to solidify inside the thermostat and close the damper.
Below we will talk in more detail about possible malfunctions of thermostats, provide instructions for replacing and checking them, and also share a technique for reworking and upgrading this part, allowing you to increase its response threshold to 92C.
Common faults
Despite the relative simplicity of the device, troubles sometimes occur with it. A malfunctioning thermostat will most likely render the vehicle unable to be driven. More often, its incorrect operation is provoked by the following reasons:
- unstable functioning of the motor (when tripling, the valve is often damaged);
- antifreeze getting inside the device;
- wax flows out;
- mechanical damage to the valve;
- deterioration of the rubber gasket;
However, there is usually one main reason - corrosion.
If for some reason the valve does not open at all, the coolant does not circulate and the power plant overheats. Moreover, the problem will arise regardless of how cold it is outside and how quickly the car accelerates.
Incomplete opening of the valve also causes overheating. True, in this case it will not be critical if external factors do not contribute to this. A delay in closing leads to a prolonged warm-up of the engine, and in winter it most likely will not be able to reach operating temperature.
Major breakdowns
Adjusting the clutch pedal on the fret grant.
Advice from experts on self-replacement Although the thermostat is small in size, its importance for the “health” of the Lada Granta engine is enormous. Among the most common reasons leading to the inevitable failure of the thermostat is corrosion.
This circumstance can lead to the movable element getting stuck in a certain position. If this happens when the valve is closed, then there is a likely risk of engine overheating (you need to monitor the temperature indicator on the device). In this case, the thermostat will need to be replaced.
When the moving component of the thermostat deigns to get stuck in the open position, the motor will take a very long time to reach the operating temperature setting or will not warm up at all, which is likely in winter.
If all components of the cooling circuit are in working order, then at zero outside temperature the Lada Granta engine warms up in 10 minutes. If the valve does not “agree” to close, then even in the summer heat the engine will not be able to warm up above the 70-degree limit.
In all of these cases, the thermostat needs to be replaced.
Now let's look at a method for checking the functionality of the thermostat.
Revision option
As evidenced by reviews from grant owners, the manufacturer supplies this model with a rather weak thermostat. Usually it opens access to antifreeze after the engine warms up to 80 radii. This is due to low-quality wax inserts, which we described above.
In most cases, such a problem is not perceived as something serious, since it does not harm the operation of the engine in any way. The only drawback is that in winter, when there is frost, the interior can be cool. The situation becomes more complicated if the owner of the car switches to gas.
In this case, it makes sense to modify the thermostat so that it opens at 92 degrees. To do this you will need to purchase a new one. The entire element does not need to be replaced, so only the insert is taken out of the purchased one.
Experts advise choosing the model – VERNET TH4898.92D. Its cost is low - approximately 400 rubles.
The step-by-step replacement procedure is as follows:
- first of all, the car is driven onto a ramp or pit;
- drain antifreeze from the cooling system;
- remove the air duct because it is in the way;
- the thermostat itself is dismantled (but you can leave it in place and only remove the cover from it, the main thing is not to lose the seal);
- the old thermocouple is removed and a new one is inserted;
- they press it with the original spring and limiter.
On average, the response temperature after such a procedure increases by 15 percent.
The whole process is recorded in this video:
All cars whose engines are cooled by a special liquid have at their disposal a device called a thermostat. Lada Granta is no exception.
In the Grant model, the thermostat is located between the radiator and the engine. In the article we will talk about the concept of a car thermostat, what components it consists of and how it functions, and also consider the main types of thermostat malfunctions.
The thermostat is called the antifreeze (antifreeze) temperature regulator in the engine cooling system. It increases the engine warm-up rate and maintains the required thermal state.
The key job of the thermostat is to hold back the flow of radiator fluid until the engine has warmed up. If the engine remains cold, the coolant does not pass through it to the radiator.
The thermostat opens when the engine temperature reaches 95 degrees. Thanks to its operation, the engine warms up faster. Thus, in the Lada Granta, the thermostat reduces the amount of harmful emissions and reduces engine wear to a minimum.
If desired, you can clearly see the operation of the thermostat at home. Place the thermostat in a container filled with water, then place it on the electric stove. As the moment of boiling water approaches, the thermostat valve will open approximately 2 cm. It is recommended to experiment with a new thermostat without removing yours from your own car.
Thermostat structure and operating conditions
The thermostat contains metals such as copper and brass alloy. The essence of the device's operation lies in a small cylinder turned towards the engine.
In the middle of the cylinder there is a synthetic wax ball, which at a certain temperature (82 degrees Celsius) begins to melt (the wax expands significantly under the influence of heat, changing its solid state to a liquid).
A special pin is pressed into the wax cylinder and is connected to a valve. When the wax melts, as a result of expansion, it begins to squeeze the pin out of the cylinder, while opening the valve through which coolant flows. When the engine stops and cools, the wax in the thermostat hardens and returns to its solid state.
Carrying out an inspection
The process of checking the thermostat is a relatively simple procedure. To begin, the removed thermostat bottle is lowered into a transparent container into which coolant has previously been poured. Next, this container is heated, periodically stirring the coolant and monitoring with a thermometer the moment when the cylinder rod begins to move. When the coolant reaches a temperature of 85C (±2C), the rod of a fully working device will begin to extend. When the liquid in the container is heated to 100C (±2C), it will extend completely.
How to tell if the thermostat is working correctly
In order to find out whether the thermostat is working or not, it is necessary to warm up the engine so that the arrow indicating the temperature does not reach the red mark of the indicator quite a bit.
After that, turn off the engine, go to the hood and open it, look for the upper radiator hose. This rubber hose is usually black in color and is approximately 5cm in diameter.
There are metal clamps at its ends. The upper hose is attached to the top of the radiator. Then we look for the lower hose. It looks like the top one, only it is attached to the bottom of the radiator.
Touch the hoses carefully; they may be hot enough to burn you. If the engine temperature indicator shows that the engine is hot, but one of the hoses is cold, then most likely the thermostat valve is closed and is not allowing coolant through the radiator.
In this case, replace the old thermostat with a new one as quickly as possible (after waiting until the engine has cooled down).
There is another “folk” method for checking the functionality of the thermostat and it is as follows. Place the thermostat in a vessel with boiled (temperature should be about 100 degrees) water.
Next, we visually observe whether the thermostat valve opens. If it opens, it means it’s working. If not, we replace the damaged one with a new one. The above method involves removing the thermostat from the car.
If the thermostat malfunctions in a car, overheating or, more often, low engine temperature is observed. Such phenomena are associated with the thermostat jamming in one position; as a result, the coolant moves in one circle (large or small). Lack of adjustment of coolant distribution leads to deviations from the engine temperature regime. Thermostat failure is one of the most common problems in a cooling system. To replace the thermostat on a Lada Granta car, the coolant from the cooling system does not need to be completely drained.
You will need: TORX TZO wrench, 13mm socket, Phillips-blade screwdriver.
Removing the thermostat Lada Granta
The thermostats of the 8-valve engines and the 16-valve Lada Granta engine are located differently, and therefore their replacement for these engines is shown separately. To remove the thermostat of the VAZ-11183, VAZ-21116 and VAZ-11186 engines, do the following: 1. Remove the plug from the expansion tank. Unscrew the drain plug at the bottom of the right radiator tank. Drain the coolant that comes out of the engine radiator into a container. Screw the drain plug back in.2. Release the clamp on the coolant temperature sensor wiring harness. 3. ...and disconnect the block from the sensor
4. Loosen the clamp securing the rear hose to the thermostat cover...
5. ...and remove the hose from the cover fitting
6. Similarly, disconnect the front hose from the thermostat housing pipe.
7. Unscrew the nut securing the ground wire to the upper stud securing the thermostat housing...
8. ...and remove the nut, washer and wire end from the stud.
