CTS V8-5.7L VIN P (2004)
Thermostat: Service and Repair
Thermostat Replacement (LS6)
Removal Procedure
Important: The water pump inlet (thermostat housing) and thermostat MUST be replaced as an assembly. The thermostat is not serviceable
separately.
1. Drain the cooling system.
2. Remove the cooling fan assembly.
3. Reposition the outlet hose clamp at the water pump inlet.
4. Remove the outlet hose from the water pump inlet.
5. Remove the thermostat housing bolts.
6. Remove the thermostat housing.
7. The thermostat and O-ring seal are integral to the thermostat housing.
Installation Procedure
1. Install a new thermostat housing.
2. Ensure that the new thermostat housing has an O-ring seal and is in the groove correctly.
3. Install the thermostat housing (with thermostat).
Notice: Refer to Fastener Notice in Service Precautions.