To check the thermostat on a car, start a cold engine and touch the upper (leading) radiator hose - it should be cold. After the coolant temperature reaches 82-87°C, the hose should begin to heat up quickly, indicating the start of fluid circulation in the large circuit. If this does not happen, remove the thermostat and check its operation.
You will need a key «at 12».
1. Drain the liquid from the cooling system.
2. Without disconnecting a hose from a cover, turn out two bolts of fastening of the thermostat.
3. Pull the lid aside...
4.... and remove the thermostat from the housing.
5. Remove the thermostat housing.
6. Take a sealing ring from a socket in a head of the block of cylinders. Replace a severely compressed, hardened or torn ring.
7. To test, lower the thermostat into a container of water heated to 78-80°C. Gradually heating the water, monitor the temperature at which the thermostat valve opens.
Note: The cooling system thermostat is considered healthy under the following conditions:
- valve opening temperature (82±1,5) °C;
- valve full opening temperature - 96°С;
- valve travel (at 96°C) - 8 mm.
8. Install the thermostat and all removed parts in the reverse order of removal.
9. Fill with coolant