Thermostat: Service and Repair

Thermostat


Do not remove the pressure cap while the system is hot or under pressure. Serious burns from coolant can occur.


Do not loosen radiator petcock with system hot and pressurized. Serious burns from coolant can occur.


The Thermostat and housing is serviced as an assembly. Do not remove the thermostat from the housing, damage to the thermostat may occur.

Removing






• Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse.

• If thermostat is being replaced, be sure that replacement is specified thermostat for vehicle model and engine type.

- Disconnect the negative battery cable.

- Remove the air intake assembly. Refer to => [ Air Cleaner Housing ] Air Cleaner Housing.

- Drain the cooling system. Refer to => [ Cooling System Draining and Filling ] Cooling System Draining and Filling.

- Remove upper radiator hose clamp and upper radiator hose at thermostat housing (1).

- Remove thermostat housing mounting bolts, thermostat housing (1) and thermostat (3).

Installing






- Clean mating areas of timing chain cover and thermostat housing (1).

- Install a new gasket on to the thermostat housing.

- Position thermostat housing (1) on the water crossover.

- Install two thermostat housing bolts. Tighten bolts to 12 Nm (106 in. lbs.).

- Install upper radiator hose on thermostat housing (1).

- Fill the cooling system. Refer to => [ Cooling System Draining and Filling ] Cooling System Draining and Filling.

- Install the air intake system. Refer to => [ Air Cleaner Housing ] Air Cleaner Housing.

- Connect the negative battery cable.

- Start and warm the engine. Check for leaks.