Thermostat Housing: Service and Repair

Thermostat Housing Replacement (4.8L, 5.3L, and 6.0L Engines)

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. Refer to Radiator Hose Replacement - Outlet (4.8L, 5.3L, and 6.OL Engines) or Radiator Hose Replacement - Outlet (8.1L Engine).
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 water pump inlet to the water pump.

Notice: Refer to Fastener Notice in Cautions and Notices.

2. Install the water pump inlet bolts.
- Tighten the water pump inlet bolts to 15 Nm (11 ft. lbs.).
3. Install the radiator outlet hose. Refer to Radiator Hose Replacement - Outlet (4.8L, 5.3L, and 6.OL Engines) or Radiator Hose Replacement - Outlet (8.1L Engine).