GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 TrailBlazer - 4WD 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 Mode Door Replacement

Removal Procedure
  1. Remove the I/P carrier. Refer to Instrument Panel Carrier Replacement.
  2. Remove the screws from the mode actuator.
  3. Remove the mode actuator.

    4. Object Number: 742346 Size: SH
  4. Remove screws in order to separate the defroster/mode outlet cover (2) from the HVAC module assembly (1).

    5. Object Number: 735981 Size: SH
  5. Remove the mode door (1) from the heater module.

Installation Procedure

    Object Number: 735981 Size: SH
  1. Install the mode door (1) to the HVAC module assembly.
  2. Install the defroster/mode outlet cover.

    3. Object Number: 742346 Size: SH
  3. Install the defroster/mode outlet cover screws to the HVAC module assembly (1).

    4. Caution: Refer to Fastener Caution in the Preface section.

  4. Install the screws to assemble the defroster/mode outlet to the HVAC module assembly.

    5. Tighten
    Tighten the screws to 1.9 N·m (18 lb in).

  5. Install the mode actuator.
  6. Install the screws to the mode actuator.

    7. Tighten
    Tighten the screws to 1.9 N·m (18 lb in).

  7. Install the I/P carrier. Refer to Instrument Panel Carrier Replacement.