Engine Coolant Thermostat Replacement RPOs L26/L32

Special Tools

J 38185 Hose Clamp Pliers

1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement.
2. Partially drain the cooling system. Refer to Cooling System Draining and Filling.
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.

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

Caution: Refer to Fastener Caution in the Preface section.

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

Tighten
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.
8. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement.

Engine Coolant Thermostat Replacement LS4

Special Tools

J 38185 Hose Clamp Pliers

1. Remove the radiator air lower baffle and deflector. Refer to Radiator Air Lower Baffle and Deflector Replacement.
2. Reposition the radiator inlet hose. Refer to Radiator Inlet Hose Replacement.
3. Partially drain the cooling system. Refer to Cooling System Draining and Filling.
4. Use the J 38185 in order to reposition the hose clamp from the water outlet housing.
5. Remove the radiator inlet hose from the water outlet housing.



6. Remove the water outlet housing bolts (302).
7. Remove the water outlet housing (303) and O-ring seal (304).
8. Remove the thermostat (305).
9. Clean and inspect the water outlet housing O-ring seal mating surfaces.

Caution: DO NOT use cooling system seal tabs, or similar compounds, unless otherwise instructed. The use of cooling system seal tabs, or similar compounds, may restrict coolant flow through the passages of the cooling system or the engine components. Restricted coolant flow may cause engine overheating and/or damage to the cooling system or the engine components/assembly.

1. Install the thermostat (305).
2. Install the O-ring seal (304) and water outlet housing (303).

Caution: Refer to Fastener Caution in the Preface section.

3. Install the water outlet housing bolts (302).

Tighten
Tighten the bolts to 15 N·m (11 lb ft).




4. Install the radiator inlet hose to the water outlet housing.
5. Use the J 38185 in order to reposition and install the hose clamp to the water outlet housing.
6. Fill the cooling system. Refer to Cooling System Draining and Filling.
7. Install the radiator inlet hose. Refer to Radiator Inlet Hose Replacement.
8. Install the radiator air lower baffle and deflector. Refer to Radiator Air Lower Baffle and Deflector Replacement.