GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2008 🢒 G8 🢒 HVAC 🢒 HVAC - Automatic 🢒 Defroster Valve Actuator Replacement

Removal Procedure
  1. Remove the I/P lower trim plate assembly. Refer to Instrument Panel Insulator Panel Replacement - Left Side.
  2. Remove the instrument panel outer trim cover. Refer to Instrument Panel Outer Trim Cover Replacement.
  3. Remove the I/P compartment assembly. Refer to Instrument Panel Compartment Replacement.
  4. Remove the left side floor duct. Refer to Floor Air Outlet Duct Replacement - Left Side.

    5. Object Number: 1958825 Size: SH
  5. Disconnect the defrost mode actuator electrical connector (1).

    6. Object Number: 1958811 Size: SH

    Important: Using a suitable tool, squeeze the rear passenger mode rod to rear passenger mode door lever retaining clip (1) to detach the rear passenger mode rod (2) from the rear passenger mode door lever (3).

  6. Detach the rear passenger mode rod (2) from the mode door lever (3).

    7. Object Number: 1958808 Size: SH
  7. Remove the defrost mode actuator to HVAC module assembly retaining screws (2).
  8. Remove the defrost mode actuator and the rear passenger mode lever (1) from the HVAC module assembly (3).

    9. Object Number: 1958901 Size: SH

    Important: Rotate the rear passenger mode rod (1) to match the actuator lever locking position opening (2), then remove rear passenger mode rod (1).

  9. Detach the rear passenger mode rod (1) from the defrost mode actuator (4).

    10. Important: Take note of the rear passenger mode lever (3) position in relation to the actuator housing (4).

  10. Gently remove the rear passenger mode lever (3) from the defrost mode actuator (4).

Installation Procedure

    Object Number: 1958901 Size: SH
  1. Install the rear passenger mode lever (3) to the defrost mode actuator (4).

    2. Important: Rotate the rear passenger mode rod (1) to match the actuator lever locking position opening (2), to install the rear passenger mode rod (1).

  2. Attach the rear passenger mode rod (1) to the actuator (4).

    3. Object Number: 1958743 Size: SH
  3. Align the actuator drive gear (1) with the door shaft spline (2).

    4. Object Number: 1958808 Size: SH
  4. Install the and the rear passenger mode lever (1) to the HVAC module assembly (3).

    5. Notice: Refer to Fastener Notice in the Preface section.

  5. Install the defrost mode actuator to HVAC module assembly retaining screws (2).

    6. Tighten
    Tighten the screws to 1 N·m (9 lb in).


    Object Number: 1958811 Size: SH

    Important: Make sure the rear passenger mode rod to rear passenger mode door lever retaining clip (1) is correctly engaged to prevent the rear passenger mode door lever (3) from functioning incorrectly.

  6. Attach the rear passenger mode rod (2) to the mode door lever (3).

    7. Object Number: 1958825 Size: SH
  7. Connect the defrost mode actuator electrical connector (1).
  8. Install left side floor duct. Refer to Floor Air Outlet Duct Replacement - Left Side.
  9. Install the I/P compartment assembly. Refer to Instrument Panel Compartment Replacement.
  10. Install instrument panel outer trim cover. Refer to Instrument Panel Outer Trim Cover Replacement.
  11. Install the I/P lower trim plate assembly. Refer to Instrument Panel Insulator Panel Replacement - Left Side.
  12. Perform HVAC system relearn. Refer to HVAC Control Module Programming and Setup.