GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove the instrument panel carrier. Refer to Instrument Panel Carrier Replacement .

  2. Object Number: 691864  Size: SH
  3. Disconnect the vacuum hose from the lower mode actuator (2).
  4. Remove the lower mode actuator (2) from the heater assembly (4).
  5. Remove the linkage from the lower mode actuator (2).
  6. Remove the heater case screws.
  7. Remove the outer heater case.

  8. Object Number: 691852  Size: SH
  9. Remove the lower mode door (1) from the inner heater case (2).

Installation Procedure


    Object Number: 691852  Size: SH
  1. Install the lower mode door (1) to the inner heater case (2).
  2. Install the outer heater case.
  3. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the heater case retaining screws.
  5. Tighten
    Tighten screws to 1.9 N·m (17 lb in).


    Object Number: 691864  Size: SH
  6. Install the linkage to the lower mode actuator (2).
  7. Install the lower mode actuator (2) to the heater assembly.
  8. Connect the vacuum hose to the lower mode actuator (2).
  9. Install the instrument panel carrier. Refer to Instrument Panel Carrier Replacement .