Thermostat: Service and Repair

Engine Coolant Thermostat Replacement (LUV)

Removal Procedure

1. Drain the cooling system. Refer to Cooling System Draining and Filling Cooling System Draining and Filling.

2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement Air Cleaner Outlet Duct Replacement.





3. Remove the engine coolant temperature sensor connector (1) and the radiator outlet hose (2).





4. Remove the water inlet pipe mounting fasteners (1).

5. Remove the water inlet seal (3) and discard.

6. Remove the thermostat (4).

Installation Procedure

1. Clean the sealing surface.





2. Install the engine thermostat (4) into the water inlet pipe (2) with a NEW seal (3).

3. Tighten the water inlet pipe mounting fasteners (1) to 9 Nm (80 lb in).





4. Install the radiator outlet hose (2) to the water inlet pipe.

5. Connect the engine coolant temperature sensor connector (1).

6. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement Air Cleaner Outlet Duct Replacement.

7. Fill the cooling system. Refer to Cooling System Draining and Filling Cooling System Draining and Filling.

8. After repairs, inspect cooling system for leaks.