Engine Coolant Thermostat Replacement 3.8L Engine

1. Remove the water outlet. Refer to Engine Coolant Thermostat Housing Replacement .
2. Remove the engine coolant thermostat (3).

1. Install the engine coolant thermostat (3).
2. Install the water outlet. Refer to Engine Coolant Thermostat Housing Replacement .

Engine Coolant Thermostat Replacement 5.7L Engine

Important: The thermostat and thermostat housing MUST be replaced as an assembly. The thermostat is not serviceable separately.

1. Open the radiator drain cock.

Partially drain the radiator.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

2. Close the drain cock.

Tighten
Tighten the drain cock to 2 N·m (18 lb in).

3. Reposition the radiator outlet hose clamp at the water pump.
4. Remove the radiator outlet hose from the water pump inlet.



5. Remove the water pump inlet bolts.
6. Remove the water pump inlet.



7. The O-ring seal is integral to the thermostat housing.
8. Remove the thermostat.

1. Install a new thermostat and housing.
2. Ensure that the new thermostat housing has an O-ring seal and is in the groove correctly.




Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the water pump inlet and bolts.

Tighten
Tighten the water pump inlet bolts to 15 N·m (11 lb ft).




4. Install the radiator outlet hose to the water pump inlet.
5. Position the radiator outlet hose clamp at the water pump.
6. Add coolant.