Thermostat Replacement

Thermostat Replacement (3.1L)

- Tools Required
- J 38185 Hose Clamp Pliers

Removal Procedure





1. Remove the air cleaner and duct assembly.
2. Partially drain the coolant.
3. Use the J 38185 in order reposition the hose clamp at the thermostat housing.
4. Disconnect the radiator hose from the thermostat housing.
5. Remove the thermostat housing attaching bolts.





6. Remove the thermostat housing and gasket.





7. Remove the thermostat.
8. Clean the mating surfaces.

Installation Procedure





1. Install the thermostat.





2. Install the thermostat housing and gasket to intake manifold.

Notice: Refer to Fastener Notice in Service Precautions.





3. Install the bolts to the housing with RTV sealer GM P/N 1052366 or the equivalent.
- Tighten the bolts to 25 Nm (18 ft. lbs.).
4. Connect the radiator hose to the thermostat housing.
5. Use the J 38185 in order reposition and install the hose clamp at the thermostat housing.
6. Install the air cleaner and duct assembly.
7. Fill the cooling system.
8. Inspect for leaks.