GM Service Manual Online
For 1990-2009 cars only

Heater Core Replacement Right

Removal Procedure

  1. Raise the hood and support.
  2. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  3. Remove the windshield wiper right link.
  4. Remove the heater hose clamps.

  5. Object Number: 229937  Size: SH
  6. Remove the heater hoses.

  7. Object Number: 229939  Size: SH
  8. Remove the heater core cover plate screws.
  9. Remove the heater core cover plate.
  10. Remove the heater core screw.

  11. Object Number: 229941  Size: SH
  12. Remove the right heater core.

Installation Procedure


    Object Number: 229941  Size: SH
  1. Install the right heater core.
  2. Install the heater core screw.
  3. Install the heater core cover plate.

  4. Object Number: 229939  Size: SH
  5. Install the heater core cover plate screws.

  6. Object Number: 229937  Size: SH
  7. Install the heater hoses.
  8. Install the heater hose clamps.
  9. Install the windshield wiper right link.
  10. Fill with engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  11. Inspect the system for leaks.
  12. Close the hood.

Heater Core Replacement Left

Removal Procedure

  1. Raise the hood and support.
  2. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  3. Remove the windshield wiper right link.
  4. Remove the heater hose clamps.

  5. Object Number: 229937  Size: SH
  6. Remove the heater hoses.

  7. Object Number: 229939  Size: SH
  8. Remove the heater core cover plate screws.
  9. Remove the heater core cover plate.
  10. Remove the heater core screw.

  11. Object Number: 229941  Size: SH
  12. Remove the left heater core.

Installation Procedure


    Object Number: 229941  Size: SH
  1. Install the left heater core.
  2. Install the heater core screw.
  3. Install the heater core cover plate.

  4. Object Number: 229939  Size: SH
  5. Install the heater core cover plate screws.

  6. Object Number: 229937  Size: SH
  7. Install the heater hoses.
  8. Install the heater hose clamps.
  9. Install the windshield wiper right link.
  10. Fill with engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  11. Inspect the system for leaks.
  12. Close the hood.