Envoy 4WD V6-4.3L VIN W (1998)
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.
