GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 TrailBlazer - 4WD 🢒 HVAC 🢒 HVAC - Automatic 🢒 Mode Valve Actuator Replacement

Removal Procedure
  1. Remove the left side sound insulator screws.
  2. Remove the left hand floor duct. Refer to Floor Air Outlet Duct Replacement - Left Side.

    3. Object Number: 1679189 Size: SH
  3. Disconnect the electrical connector from the mode actuator.
  4. Remove the screws from the mode actuator (1).
  5. Remove the mode actuator.

Installation Procedure

    Object Number: 1679189 Size: SH

    Note: The new actuator is in Bi-Level mode. Place the door in the middle of the travel position before you install the actuator.

  1. Install the mode actuator (1).

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

  2. Install the screws to the mode actuator (1) and tighten to 1.9 N·m (18 lb in).
  3. Install the left hand floor duct. Refer to Floor Air Outlet Duct Replacement - Left Side.
  4. Install the left side sound insulator screws.
  5. Recalibrate the mode actuator. Refer to Actuator Recalibration