GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove the I/P carrier. Refer to Instrument Panel Carrier Replacement.
  2. Remove the heater assembly cover retaining screws.
  3. Remove the heater assembly cover.

  4. Object Number: 668959  Size: SH
  5. Disconnect the vacuum hose (1) from the defrost actuator (2).
  6. Depress the clip and remove the defrost actuator (2) from the heater assembly.

  7. Object Number: 691843  Size: SH
  8. Remove the defroster door (2) door from the heater assembly (1).

Installation Procedure


    Object Number: 691843  Size: SH
  1. Install the defroster door (2) to the heater assembly (1).

  2. Object Number: 668959  Size: SH
  3. Install the defrost actuator (2) to the heater assembly.
  4. Connect the vacuum hose (1) to the defrost actuator (2).
  5. Install the heater assembly cover.
  6. Caution: Refer to Fastener Caution in the Preface section.

  7. Install the heater assembly cover retaining screws and tighten to 1.9 N·m (17 lb in).
  8. Install the I/P carrier. Refer to Instrument Panel Carrier Replacement.