GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 DeVille 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Auxiliary Mode Valve Actuator Replacement

Removal Procedure

    Object Number: 592447 Size: SH
  1. Remove the auxiliary blower motor and instrument panel support bracket assembly from the vehicle. Refer to Auxiliary Blower Motor Replacement in Heating, Ventilation, and Air Conditioning.
  2. Remove the fasteners (1) from the rear HVAC extension duct (2) in order to remove both halves of the extension duct (2) from the rear HVAC assembly.
  3. Remove both halves of the extension duct (2) from the auxiliary HVAC assembly.

    4. Object Number: 592445 Size: SH
  4. Remove the bolts (1) which retain the auxiliary HVAC assembly (2) to the center support bracket.

    5. Object Number: 592443 Size: SH
  5. Remove the auxiliary blower motor assembly (1) from the instrument panel center support bracket (2).

    6. Object Number: 592441 Size: SH
  6. Remove the electrical connector (2) from the auxiliary mode actuator.
  7. Remove the screws (1) from the auxiliary mode actuator.

    8. Object Number: 592439 Size: SH
  8. Remove the auxiliary mode actuator (1) from the blower motor assembly (2).

Installation Procedure

    Object Number: 592439 Size: SH
  1. Position the auxiliary mode actuator (1) in place on the rear blower motor assembly (2).

    2. Object Number: 592441 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2. Install the auxiliary mode actuator screws (1).

    3. Tighten
    Tighten the screws (1) to 1.4 N·m (12 lb in).

  3. Connect the auxiliary mode actuator electrical connector (2).

    4. Object Number: 592443 Size: SH
  4. Install the blower motor assembly (1) to the instrument panel center support bracket (2).

    5. Object Number: 592445 Size: SH
  5. Install the bolts (1) to retain the auxiliary HVAC blower motor assembly (2) to the instrument panel center support bracket.

    6. Tighten
    Tighten bolts to 2 N·m (18 lb in).


    Object Number: 592447 Size: SH
  6. Install both halves of the rear extension duct (2) to the rear HVAC assembly.
  7. Install the screws in order to hold the rear extension duct to the auxiliary HVAC assembly.

    8. Tighten
    Tighten screws to 1.4 N·m (12 lb in).

  8. Install the auxiliary blower motor and instrument panel center support bracket assembly into the vehicle. Refer to Auxiliary Blower Motor Replacement in Heating, Ventilation, and Air Conditioning.
  9. Recalibrate the actuators. Refer to Actuator Recalibration .