Pic. 5.60. Thermostat: 1 - radiator outlet hose; 2, 6, 8 - clamps; 3 – bolts of fastening of the case of the thermostat; 4 - sealing gaskets of the thermostat housing; 5 - thermostat housing; 7 - hose to the outlet pipe of the water jacket; 9 – a liquid hose of a broad tank.
The need to replace the thermostat may arise when the engine temperature is unstable: overheating or insufficient heating.
To check the thermostat on a car, start a cold engine and touch the right (diverting) hose 1 (pic. 5.60) radiator - it must be cold. After the coolant temperature reaches 60°C, the hose should begin to heat up rapidly, indicating the start of fluid circulation in the large circuit. If this does not happen, and the coolant temperature sensor and engine control unit are OK, replace the thermostat.
You will need: socket head "10", sliding pliers.
1. Disconnect a wire from the minus plug of the storage battery.
2. Drain the liquid from the engine cooling system (see Coolant Change).
3. Remove generator (see Generator Removal and Installation).
4. Having loosened the clamps with sliding pliers, slide them along the hoses and remove the hoses from the nozzles of the thermostat housing.
5. Disconnect the wiring harness block from the thermostat by squeezing the clamp of its fastening.
6. Turn out four bolts 3 (see fig. 5.60) fastening the thermostat housing to the cylinder block and remove the thermostat.
7. Install the parts in the reverse order of removal. Bolts of fastening of the case of the thermostat tighten evenly crosswise the moment of 9 Nm (0.9 kgf·m).
8. Fill liquid into the engine cooling system and remove air from it (see Coolant Change).
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