Heater Hose: Service and Repair

Removal Procedure

1. Drain the engine coolant.





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.

Installation Procedure

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 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.
11. Inspect the system for leaks.