Envoy 4WD V8-5.3L VIN P (2004)
Thermostat: Service and Repair
Thermostat Replacement (5.3L Engine)
Removal Procedure
Important: The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.
1. Remove the radiator outlet hose.
2. Remove the water pump inlet bolts.
3. Remove the water pump inlet and thermostat from the water pump.
Installation Procedure
1. Install the thermostat and thermostat housing to the water pump.
Notice: Refer to Fastener Notice in Service Precautions.
2. Install the thermostat housing bolts.
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Tighten the bolts to 15 Nm (111 ft. lbs.).
3. Install the radiator outlet hose.
