GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Blazer - 4WD - RHD 🢒 Engine 🢒 Engine Cooling 🢒 Heater Inlet Hose Replacement

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

    2. Object Number: 529 Size: SH
  2. Disconnect the heater inlet and hose clamps at the heater core.
  3. Remove the heater inlet and hose from the heater core.

    4. Object Number: 531051 Size: SH
  4. Disconnect the heater inlet hose clamp at the intake manifold fitting.
  5. Remove the heater inlet hose from the intake manifold fitting.

    6. Object Number: 531473 Size: SH
  6. Remove the heater inlet retaining clip above the right side valve cover. Use a flat bladed tool to open the clip from the bottom.
  7. Remove the heater inlet hose from the vehicle.

Installation Procedure
  1. Apply lubricant (GM Up/N 9985662) to each end of the heater inlet hose.

    2. Important: When installing new heater inlet hose, place the clamps on the hose before installing the hose to the vehicle.

  2. Install the heater inlet hose to the vehicle.
  3. Install the heater inlet hose to the intake manifold fitting.
  4. Install the heater inlet hose clamp at the intake manifold fitting.

    5. Object Number: 529 Size: SH
  5. Install the heater inlet hose to the heater core.
  6. Install the heater inlet hose clamp at the heater core.

    7. Object Number: 531473 Size: SH
  7. Install the heater inlet hose in the retaining clip above the right side valve cover.
  8. Close the retaining clip. Ensure that the clip locks.
  9. Fill the engine cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.