Heater Hose: Service and Repair
Removal Procedure1. 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 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.
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 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.
13. Inspect the system for leaks.