Thermostat: Service and Repair

Engine Coolant Thermostat Replacement (LD8) (4.6L)

Special Tools

J 38185 Hose Clamp Pliers

Removal Procedure




1. Remove the air cleaner. Refer to Air Cleaner Assembly Replacement (Service and Repair).
2. Drain the cooling system. Refer to Cooling System Draining and Filling (Vac-N-Fill) (Service and Repair)Cooling System Draining and Filling (Static Fill) (Service and Repair).
3. Remove the radiator outlet hose from the thermostat housing using the J 38185 Hose Clamp Pliers




4. Remove the thermostat housing bolts.




5. Remove the thermostat housing, thermostat, and gasket from the water pump housing.
6. Discard the old thermostat housing gasket.

Installation Procedure




1. Install a NEW thermostat housing gasket into the water pump housing.
2. Install the thermostat into the water pump housing.
3. Install the thermostat housing.





Caution: Refer to Fastener Caution (Fastener Caution).

4. Install the thermostat housing bolts.

Tighten the bolts to 10 Nm (89 lb in).




5. Install the radiator outlet hose to the thermostat housing using the J 38185 Hose Clamp Pliers
6. Fill the cooling system. Refer to Cooling System Draining and Filling (Vac-N-Fill) (Service and Repair)Cooling System Draining and Filling (Static Fill) (Service and Repair).
7. Install the air cleaner. Refer to Air Cleaner Assembly Replacement (Service and Repair).