Thermostat Housing: Service and Repair

Engine Coolant Thermostat Housing Replacement (RPOs LZE, LZ4, LZG) (3.5L, 3.9L)

Removal Procedure





1. Drain the cooling system. Refer to Cooling System Draining and Filling (9C1, 9C3 Static Fill) (Service and Repair)Cooling System Draining and Filling (LZE, LZ4, LZG, 9C1, 9C3, GE47716 Fill) (Service and Repair)Cooling System Draining and Filling (LZE, LZ4, LZG, Static Fill) (Service and Repair) .
2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement or Air Cleaner Outlet Duct Replacement .
3. Reposition the radiator outlet hose clamp at the thermostat housing.
4. Remove the radiator outlet hose from the thermostat housing (3.5L shown, 3.9L similar).




5. Remove the thermostat housing bolt/stud.
6. Remove the thermostat housing and gasket.
7. Clean the gasket surfaces.



Installation Procedure





1. Position a NEW gasket and the thermostat housing to the engine block.

Notice: Refer to Fastener Notice .

2. Install the thermostat housing bolt/stud.

Tighten the bolt/stud to 10 N.m (89 lb in).





3. Install the radiator outlet hose to the thermostat housing (3.5L shown, 3.9L similar).
4. Position the radiator outlet hose clamp at the thermostat housing.
5. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement or Air Cleaner Outlet Duct Replacement .
6. Fill the cooling system. Refer to Cooling System Draining and Filling (9C1, 9C3 Static Fill) (Service and Repair)Cooling System Draining and Filling (LZE, LZ4, LZG, 9C1, 9C3, GE47716 Fill) (Service and Repair)Cooling System Draining and Filling (LZE, LZ4, LZG, Static Fill) (Service and Repair) .
7. Inspect the system for leaks.