Thermostat: Service and Repair

Engine Coolant Thermostat Replacement

Removal Procedure




1. Partially drain the cooling system. Refer to Cooling System Draining and Filling (Cooling System Draining and Filling).
2. Remove the radiator outlet hose from the thermostat housing.
3. Remove the heater inlet and outlet hoses.
4. Remove the surge tank outlet hose.
5. Remove the thermostat housing bolts (1).
6. Remove the housing.
7. Remove the thermostat (2) and discard the thermostat gasket.

Installation Procedure




1. Install the thermostat (2) with a NEW thermostat gasket.

Caution: Refer to Fastener Caution (Fastener Caution).

2. Install the thermostat housing bolts (1) and tighten to 10 Nm (89 lb in).
3. Install the surge tank outlet hose.
4. Install the heater inlet and outlet hoses.
5. Install the radiator outlet hose to the thermostat housing.
6. Fill the cooling system. Refer to Cooling System Draining and Filling (Cooling System Draining and Filling).