GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 659558  Size: SH
  1. Remove the instrument panel accessory trim plate. Refer to Instrument Panel Cluster Trim Plate Bezel Replacement.
  2. Remove the screws from the HVAC control module.
  3. Depress the control assembly retaining tabs and remove the HVAC control module from the instrument panel.
  4. Disconnect the electrical connectors from the HVAC control module.

Installation Procedure

    Important: The Key should be in the off position when connecting the electrical connectors to ensure proper calibration.


    Object Number: 659558  Size: SH
  1. Connect the electrical connectors to the HVAC control module.
  2. Install the HVAC control module into the instrument panel, ensuring that the HVAC control module retaining tabs lock into place.
  3. 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.

  4. Install the screws from the HVAC control module.
  5. Tighten
    Tighten the screws to 1.9 N·m (17 lb in).

  6. Install the instrument panel accessory trim plate. Refer to Instrument Panel Cluster Trim Plate Bezel Replacement.
  7. Important: Do not adjust any controls on the HVAC control module while the HVAC control module is calibrating.

    If interrupted improper HVAC performance will result.

  8. Start the vehicle and let run for one minute .
  9. Refer to Control Module References for programming and setup information.