GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 XLR 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 Heater Core Cover Replacement

Removal Procedure
  1. Remove the HVAC module. Refer to HVAC Module Assembly Replacement .

    2. Object Number: 1226250 Size: SH
  2. Disconnect the HVAC module wiring harness retainer pin (2) from the HVAC module.
  3. Disconnect the wiring harness from the heater core cover wire harness retainer (1) and reposition the wiring harness aside.
  4. Disconnect the wiring harness from the heater core cover wire harness retainer (3) and reposition the wiring harness aside.

    5. Object Number: 1224367 Size: SH
  5. Disconnect the discharge temperature management (DTM) sensor electrical connectors.

    6. Important: Rotate the DTM sensor counter-clockwise to disengage the sensor from the air duct.

  6. Remove the DTM sensors.

    7. Object Number: 1224370 Size: SH
  7. Remove the heater core cover screws.
  8. Remove the heater core cover.

Installation Procedure
  1. Install the heater core cover.

    2. 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.


    Object Number: 1224370 Size: SH
  2. Install the heater core cover screws.

    3. Tighten
    Tighten the screws to 1.6 N·m (14 lb in).

    Important: Rotate the DTM sensor clockwise to engage the sensor to the air duct.

  3. Install the DTM sensors.

    4. Object Number: 1224367 Size: SH
  4. Connect the discharge temperature management (DTM) sensor electrical connectors.
  5. Connect the wiring harness to the heater core cover wire harness retainer (1).
  6. Connect the wiring harness to the heater core cover wire harness retainer (3).

    7. Object Number: 1226250 Size: SH
  7. Connect the HVAC module wiring harness retainer pin (2) to the HVAC module.
  8. Install the HVAC module. Refer to HVAC Module Assembly Replacement .