Thermostat Housing: Service and Repair

Removal

CAUTION: Do not mix Standard (green) Coolant with Extended Life Coolant (orange). If mixing occurs, drain engine cooling system and refill with originally equipped coolant type. If this contamination occurs the service change interval on Extended Life Coolant will be reduced from 6 years/150,000 miles to 3 years/30,000 miles.

1. Disconnect the battery ground cable
2. Remove the air cleaner outlet tube.
3. Drain the engine coolant to a point below the water thermostat.





4. Disconnect the water temperature indicator sender unit and the engine coolant temperature sensor electrical connectors.





5. Disconnect the upper radiator hose and the heater coolant hose from the water thermostat housing.





6. Remove the water thermostat housing bolts, the water thermostat housing, and the water thermostat.

Installation





1. Note: Make sure all of the gasket surfaces are free of all gasket material. Make sure the tabs on the water thermostat engage properly into slots in thermostat housing.

Follow the removal procedure in reverse order.
2. Fill the cooling system.
3. Start the engine and check all hoses and connections for leaks. Allow the engine to warm up so that the water thermostat opens.
4. Stop the engine. Top off coolant recovery reservoir as required to maintain minimum cold fill level.