GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 38185 Hose Clamp Pliers

Removal Procedure

Important: In order to access the heater core care must be taken when moving the heater core cover. The cover may crack, especially when cold.


    Object Number: 247325  Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. Position the J 38185 in order to remove the heater hose clamps.

  3. Object Number: 247330  Size: SH
  4. Remove the heater hoses from the heater core.
  5. Remove the console assembly. Refer to Console Replacement in Instrument Panel, Gages and Console.
  6. Remove the auxiliary air distribution duct. Refer to Auxiliary Air Distributor Duct Replacement .

  7. Object Number: 378336  Size: SH
  8. Remove the heater core heat shield cover from the HVAC module assembly.
  9. Remove the air filter access cover.
  10. Remove the heater core cover screws.
  11. Lower and move the cover to obtain enough access to remove the heater core.

  12. Object Number: 292125  Size: SH
  13. Remove the retaining screws (1) and straps from the heater core.
  14. Remove the heater core.

Installation Procedure

  1. Install the heater core into the HVAC module.

  2. 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.

  3. Install the retaining straps and screws (1).
  4. Tighten
    Tighten the screws to 1.5 N·m (18 lb in).

  5. Install the heater core cover.

  6. Object Number: 378336  Size: SH
  7. Install the attaching screws.
  8. Tighten
    Tighten the screws to 1.4 N·m (12 lb in).

  9. Install the air filter access cover.
  10. Tighten
    Tighten the screws to 1.4 N·m (12 lb in).

  11. Install the heater core heat shield cover.
  12. Install the auxiliary air distribution duct. Refer to Auxiliary Air Distributor Duct Replacement .
  13. Install the console assembly. Refer to Console Replacement in Instrument Panel, Gages and Console.

  14. Object Number: 247330  Size: SH
  15. Install the heater hoses using the J 38185 .
  16. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.