GM Service Manual Online
For 1990-2009 cars only

Auxiliary Mode Valve Actuator Replacement Tahoe/Yukon

Removal Procedure

Notice: In order to avoid actuator damage, DO NOT apply power to the actuator when it is not installed in the HVAC module.

  1. Remove the right rear quarter trim panel. Refer to Rear Quarter Trim Panel Replacement - Right Side .
  2. Disconnect the electrical connector from the mode actuator (1).
  3. Remove the retaining screws from the mode actuator.

  4. Object Number: 621734  Size: SH
  5. Remove the mode actuator (1) from the vehicle.

Installation Procedure


    Object Number: 621734  Size: SH
  1. Install the mode actuator (1) to the vehicle.
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the screws to the mode actuator (1).
  4. Tighten
    Tighten the screws to 1.6 N·m (14 lb in).

  5. Connect the electrical connector to the mode actuator.
  6. Install the left rear quarter trim panel. Refer to Rear Quarter Trim Panel Replacement - Right Side .

Auxiliary Mode Valve Actuator Replacement Suburban/Yukon XL

Removal Procedure

Notice: In order to avoid actuator damage, DO NOT apply power to the actuator when it is not installed in the HVAC module.

  1. Remove the right rear quarter trim panel. Refer to Rear Quarter Trim Panel Replacement - Right Side .
  2. Disconnect the electrical connector from the mode actuator (1).
  3. Remove the retaining screws from the mode actuator.

  4. Object Number: 621734  Size: SH
  5. Remove the mode actuator (1) from the vehicle.

Installation Procedure


    Object Number: 621734  Size: SH
  1. Install the mode actuator (1) to the vehicle.
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the screws to the mode actuator (1).
  4. Tighten
    Tighten the screws to 1.6 N·m (14 lb in).

  5. Connect the electrical connector to the mode actuator.
  6. Install the right rear quarter trim panel. Refer to Rear Quarter Trim Panel Replacement - Right Side .