Thermostat: Service and Repair

Engine Coolant Thermostat Replacement (5.3L Engine)

Removal Procedure

Note: The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.




1. Remove the radiator outlet hose. Refer to Radiator Outlet Hose Replacement (LL8) (Radiator Outlet Hose Replacement)Radiator Outlet Hose Replacement (LH6) (Radiator Outlet Hose Replacement).
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.

Caution: Refer to Fastener Caution (Fastener Caution).

2. Install the thermostat housing bolts and tighten to 15 Nm (11 ft. lbs.).
3. Install the radiator outlet hose. Refer to Radiator Outlet Hose Replacement (LL8) (Radiator Outlet Hose Replacement)Radiator Outlet Hose Replacement (LH6) (Radiator Outlet Hose Replacement).