Tools Required

J 38185 Hose Clamp Pliers

1. Partially drain the engine coolant from the cooling system. Refer to Cooling System Draining and Filling .
2. Remove the radiator hose clamp from the water inlet housing using the J 38185 .
3. Disconnect the radiator hose from he water inlet housing.



4. Remove the heater hose clamp from the water inlet housing using the J 38185 .
5. Disconnect the heater hose from the water inlet housing.



6. Remove the surge tank inlet hose clamp from the water inlet housing using the J 38185 .
7. Disconnect the surge tank inlet hose from the water inlet housing.



8. Remove the water inlet housing bolts.
9. Remove the water inlet housing.
10. Inspect and clean the mating surfaces.
11. Replace inlet housing (2) and thermostat as an assembly.

NOTICE: When adding coolant, it is important that you use GM Goodwrench DEX-COOL® or HAVOLINE® DEX-COOL® coolant. If Coolant other than DEX-COOL® or HAVOLINE® DEX-COOL® is added to the system the engine coolant will require change sooner; at 50 000 km (30,000 mi) or 24 months.

1. Install the water inlet housing (2) and thermostat assembly.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

2. Install the water housing bolts with RTV Sealer GM P/N 1052366 or equivalent.

Tighten
Tighten the water inlet housing bolts to 9 N·m (80 lb in).




3. Connect the surge tank inlet hose to the water inlet housing.
4. Install the surge tank inlet hose clamp to the water inlet housing using the J 38185 .



5. Connect the heater hose to the water inlet housing.



6. Install the heater hose clamp to the water inlet housing using the J 38185 .
7. Connect the radiator hose to the water inlet housing.
8. Install the radiator hose clamp to the water inlet housing using the J 38185 .
9. Fill the cooling system with engine coolant. Refer to Cooling System Draining and Filling .
10. Inspect for leaks.