1 - radiator drain plug; 2 - thermostat; 3 - hose to the pump inlet pipe; 4 - hose to the expansion tank; 5 - lower radiator hose (outlet)
If the engine overheats while running or is slow to reach operating temperature, the thermostat should be checked.
To check the thermostat on your car, start the engine and touch the lower radiator hose with your hand. It should be cold. Once the coolant temperature reaches 87–92°C, the hose should start to heat up. If this does not happen, you need to remove the thermostat and check its functionality.
Thermostat: 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 – branch pipe (from the expansion tank); 11 – piston
The information is published on the website: vazbook.ru
1. Loosen the crankcase guard mounting bolts and remove it.
2. Unscrew the expansion tank cap.
3. Place a container under the drain hole, unscrew the drain plug of the cylinder block and drain the coolant from the cylinder block.
4. Place a container under the drain hole, unscrew the radiator drain plug and drain the coolant from the radiator.
5. Loosen the clamps.
6. Disconnect the three hoses from the thermostat housing.
7. Loosen the clamp and remove the thermostat with the hose. Then disconnect the short hose from the thermostat.
8. Place the thermostat in water heated to 78–80°C. Heat the water, stirring constantly, to (87±2)°C.
9. 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.