Thermostat: Service and Repair

Engine Coolant Thermostat Replacement (RPOs L26/L32)

Tools Required

J 38185 Hose Clamp Pliers

Removal Procedure




1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (Service and Repair).
2. Partially drain the cooling system. Refer to Cooling System Draining and Filling (L26, LY7 GE 47716 Fill) (Service and Repair)Cooling System Draining and Filling (L26 Static Fill) (Service and Repair).
3. Use the J 38185 in order to reposition the hose clamp from the water outlet housing.
4. Remove the radiator inlet hose from the water outlet housing.




5. Reposition the wiring harness from the water outlet housing stud.
6. Remove the water outlet housing bolt and the stud.
7. Remove the water outlet housing and the gasket.
8. Remove the thermostat.
9. Clean and Inspect the water outlet housing gasket mating surfaces.

Installation Procedure




1. Install the thermostat.
2. Install the gasket and the water outlet housing.

Notice: Refer to Fastener Notice (Fastener Notice).

3. Install the water outlet housing bolt and the stud to the water outlet housing.

Tighten the bolt and the stud to 27 N.m (20 lb ft).

4. Install the wiring harness to the water outlet housing stud.




5. Install the radiator inlet hose to the water outlet housing.
6. Use the J 38185 in order to reposition and install the hose clamp to the water outlet housing.
7. Fill the cooling system. Refer to Cooling System Draining and Filling (L26, LY7 GE 47716 Fill) (Service and Repair)Cooling System Draining and Filling (L26 Static Fill) (Service and Repair).
8. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (Service and Repair).