Thermostat: Service and Repair

Engine Coolant Thermostat Replacement (LH2) (4.6L)

Removal Procedure




1. Drain the cooling system. Refer to Cooling System Draining and Filling (GE 47716) (Service and Repair)Cooling System Draining and Filling (Static Fill) (Service and Repair).
2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement (Service and Repair).
3. Remove the radiator hose from the thermostat housing. Refer to Radiator Outlet Hose Replacement (LY7) (Service and Repair).
4. Remove the heater hose from the thermostat housing. Refer to Heater Outlet Hose Replacement (LH2) (Service and Repair)Heater Outlet Hose Replacement (LY7) (Service and Repair).
5. Remove the thermostat housing bolts.
6. Remove the thermostat housing (1) with thermostat (3), from the water housing.
7. Remove and discard the seal ring (2).
8. Remove the thermostat from the thermostat housing.

Installation Procedure




1. Clean the thermostat housing and water housing sealing surfaces.
2. Install the new thermostat to the thermostat housing.
3. Install the NEW seal (2) to the thermostat housing.
4. Install the thermostat housing (1) with the thermostat (3) and the seal (2) to the water housing.

Caution: Refer to Fastener Caution (Fastener Caution).

5. Install the thermostat housing bolts and tighten to 10 Nm (89 lb in).
6. Install the heater hose to the thermostat housing. Refer to Heater Outlet Hose Replacement (LH2) (Service and Repair)Heater Outlet Hose Replacement (LY7) (Service and Repair).
7. Install the radiator hose to the thermostat housing. Refer to Radiator Outlet Hose Replacement (LY7) (Service and Repair).
8. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement (Service and Repair).
9. Fill the cooling system. Refer to Cooling System Draining and Filling (GE 47716) (Service and Repair)Cooling System Draining and Filling (Static Fill) (Service and Repair).