GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 1837004  Size: SH
  1. Partially drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Remove the heater pipe outlet hose (1) from the heater outlet pipe.
  3. Remove the heater inlet pipe. Refer to Heater Inlet Pipe Replacement .

  4. Object Number: 1837062  Size: SH
  5. Remove the heater outlet pipe (1).
  6. Remove the heater outlet pipe O-ring (2). Discard O-ring.

Installation Procedure


    Object Number: 1837062  Size: SH
  1. Install a NEW heater inlet pipe O-ring.
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the heater outlet pipe (1).

  4. Object Number: 1837004  Size: SH
  5. Install the heater outlet hose (1) to the heater outlet pipe.
  6. Install the heater inlet pipe. Refer to Heater Inlet Pipe Replacement .