GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2009 🢒 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. Note: 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. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1224370 Size: SH
  2. Install the heater core cover screws and tighten to 1.6 N·m (14 lb in).

    3. Note: 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.