GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove instrument panel compartment assembly. Refer to Instrument Panel Compartment Replacement.

  2. Object Number: 2028009  Size: SH

    Note: The graphic shows air inlet housing without attaching parts for better clarity.

  3. Disconnect electrical connector and remove 3 mode control cam actuator screws (2) and remove mode control cam actuator (1).

  4. Object Number: 2028011  Size: SH
  5. Remove air inlet valve and inside air valve control cam (1).

  6. Object Number: 2028029  Size: SH
  7. Remove 2 vent valve levers (1).

Installation Procedure


    Object Number: 2027978  Size: SH

    Note: The vent valve levers have to be fitted to the according vent valve gears in figured position. The air circulation dampers have to be in middle position.

  1. Install 2 vent valve levers (1).

  2. Object Number: 2028011  Size: SH

    Note: The air inlet valve and inside air valve control cam can only be fitted in one position.

  3. Install air inlet valve and inside air valve control cam (1).
  4. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 2028009  Size: SH
  5. Install mode control cam actuator (1) and install 3 mode control cam actuator screws (2) and connect electrical connector.
  6. Tighten
    2.5 N·m (23 lb in).

  7. Install instrument panel compartment assembly. Refer to Instrument Panel Compartment Replacement.