Heater Outlet Hose Replacement 4.3L

Tools Required

J 38185 Hose Clamp Pliers

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



2. Release the outlet heater hose clamp using the J 38185 at the heater core.
3. Remove the outlet heater hose from the heater core.



4. Release the heater inlet hose clamp using the J 38185 at the intake manifold fitting.
5. Remove the heater inlet hose from the intake manifold fitting.
6. Release the heater outlet hose clamp using the J 38185 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 outlet heater hose retaining clip above the right side valve cover. Use a flat bladed tool to open the clip from the bottom.
10. Remove the outlet heater hose from the vehicle.

1. Apply lubricant, GM P/N 9985662, to each end of the outlet heater hose.

Important: When installing new outlet heater hose, place the clamp on the hose before installing the hose to the vehicle.

2. Install the outlet heater hose to the vehicle.



3. Install the heater outlet hose to the water pump.
4. Install the heater outlet hose clamp using the J 38185 at the water pump.
5. Install the heater inlet hose to the intake manifold fitting.
6. Install the heater inlet hose clamp using the J 38185 at the intake manifold fitting.



7. Install the outlet heater hose to the heater core.
8. Install the outlet heater hose clamp using the J 38185 at the heater core.



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



10. Place the outlet heater hose 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.