Thermostat: Service and Repair

Thermostat Replacement (4.2L Engine)

Tools Required
^ J 38185 Hose Clamp Pliers

Removal Procedure
1. Remove the necessary coolant from the radiator.





2. Loosen the outlet hose clamp at the water inlet (1) of the thermostat. Remove the outlet hose from the water inlet.





3. Remove the thermostat housing at the water inlet bolts.
4. Remove the thermostat housing from the engine block.
5. Clean all of the surfaces of the thermostat housing.
6. Clean the sealing surface of the engine block.

Installation Procedure





1. Install the thermostat housing at the water inlet to the engine block.

Notice: Refer to Fastener Notice in Service Precautions.

2. Install the thermostat housing bolts.
^ Tighten the bolts to 10 Nm (89 inch lbs.).

3. Lubricate the inner diameter of the radiator hose with engine coolant.





4. Install the outlet hose to the thermostat (1). Secure the hose with the clamp.
5. Fill the cooling system with specified coolant and concentration.
6. Inspect all sealing surfaces for leaks after starting the engine.