GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 37097-A Heater Hose Clamp Tool

Removal Procedure

  1. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. Using the J 37097-A disconnect the heater hoses from the heater core.
  3. Remove the auxiliary blower motor assembly. Refer to Auxiliary Blower Motor Replacement .

  4. Object Number: 292121  Size: SH
  5. Remove the heater core cover screws (1).

  6. Object Number: 292125  Size: SH
  7. Remove the heater core retaining screws (1).

  8. Object Number: 292087  Size: SH
  9. Remove the heater core retaining straps.
  10. Remove the heater core.
  11. Remove the heater core case seals.

Installation Procedure


    Object Number: 292087  Size: SH
  1. Install the heater core.
  2. Install the heater core retaining straps.
  3. Install the new heater core case seals.

  4. Object Number: 292125  Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  5. Install the heater core retaining screws (1).
  6. Tighten
    Tighten the screws (1) to 1.4 N·m (13 lb in).


    Object Number: 292121  Size: SH
  7. Install the heater core cover screws (1).
  8. Tighten
    Tighten the screws (1) to 1.4 N·m (13 lb in).

  9. Install the auxiliary blower motor assembly. Refer to Auxiliary Blower Motor Replacement .
  10. Using theJ 37097-A connect the heater hoses to the heater core.
  11. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.