Thermostat Replacement

Thermostat Replacement (3.8L)

- Tools Required
- J 38185 Hose Clamp Pliers

Removal Procedure





1. Remove the fuel injector sight shield.
2. Partially drain the engine coolant from the coolant system.
3. Disconnect the throttle body air inlet duct.
4. Use the J 38185 in order to reposition the hose clamp at the water outlet housing. Disconnect the radiator hose from the water outlet housing.





5. Remove from the water outlet housing bolts.
6. Remove the water outlet housing and gasket.
7. Remove the thermostat.
8. Inspect and clean the mating surfaces.
- Water outlet housing
- Lower intake manifold

Installation Procedure





1. Install the thermostat.
2. Install the gasket and the water outlet housing.

Notice: Refer to Fastener Notice in Service Precautions.

3. Install the water outlet housing bolts with RTV Sealer GM P/N 1052366 or equivalent.
- Tighten the bolts to 27 Nm (20 ft. lbs.).





4. Connect the radiator hose to the water outlet housing. Use the J 38185 in order to reposition and install the hose clamp at the water outlet housing.
5. Install the throttle body air inlet duct.
6. Fill the cooling system.
7. Install the fuel injector sight shield.
8. Inspect for leaks.