Heater Hoses Replacement 2.2 L

1. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.



2. Release the heater inlet and outlet hose clamps at the heater core.
3. Remove the heater inlet and outlet hoses from the heater core.



4. Release the heater inlet hose clamp at the engine water outlet adapter pipe.
5. Remove the heater inlet hose from the engine water outlet adapter pipe.



6. Release the heater outlet hose clamp at the water pump.
7. Remove the heater outlet hose from the water pump.



8. Remove the heater outlet hose bracket bolt.
9. Remove the heater inlet and outlet hoses from the vehicle.

1. Apply lubricant (GM P/N 9985662) to each end of the heater inlet and outlet hoses.

Important: When installing new heater inlet and outlet hoses, place the clamps on the hoses before installing the hoses to the vehicle.

2. Install the heater inlet and outlet hoses to the vehicle.




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.

3. Install the heater outlet hose bracket bolt.

Tighten
Tighten the bolt to 27 N·m 20 lb ft).




4. Install the heater outlet hose to the water pump.
5. Install the heater outlet hose clamp at the water pump.



6. Install the heater inlet hose to the engine water outlet adapter pipe.
7. Install the heater inlet hose clamp at the engine water outlet adapter pipe.



8. Install the heater inlet and outlet hoses to the heater core.
9. Install the heater inlet and outlet hose clamps at the heater core.
10. Fill the engine cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
11. Inspect the system for leaks.

Heater Hoses Replacement 4.3 L

1. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.



2. Release the heater inlet and outlet hose clamps at the heater core.
3. Remove the heater inlet and outlet hoses from the heater core.



4. Release the heater inlet hose clamp at the intake manifold fitting.
5. Remove the heater inlet hose from the intake manifold fitting.
6. Release the heater outlet hose clamp at the water pump.
7. Remove the heater outlet hose from the water pump.



8. Remove the heater outlet hose from the retaining clip at the engine water outlet.



9. Open the heater inlet and outlet hose retaining clip above the right side valve cover. Use a flat bladed tool to open the clip from the bottom.
10. Remove the heater inlet and outlet hoses from the vehicle.

1. Apply lubricant (GM P/N 9985662) to each end of the heater inlet and outlet hoses.

Important: When installing new heater inlet and outlet hoses, place the clamps on the hoses before installing the hoses to the vehicle.

2. Install the heater inlet and outlet hoses to the vehicle.



3. Install the heater outlet hose to the water pump.
4. Install the heater outlet hose clamp at the water pump.
5. Install the heater inlet hose to the intake manifold fitting.
6. Install the heater inlet hose clamp at the intake manifold fitting.



7. Install the heater inlet and outlet hoses to the heater core.
8. Install the heater inlet and outlet hose clamps at the heater core.



9. Install the heater outlet hose to the retaining clip at the engine water outlet.



10. Place the heater inlet and outlet hoses in the retaining clip above the right side valve cover.
11. Close the retaining clip. Ensure that the clip locks.
12. Fill the engine cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
13. Inspect the system for leaks.