GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2003 🢒 Century 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Defroster Valve Actuator Replacement

Removal Procedure
  1. Remove the right instrument panel insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Right Side in Instrument Panel, Gages and Console.
  2. Remove the I/P compartment. Refer to Instrument Panel Compartment Replacement in Instrument Panel, Gages, and Console.

    3. Object Number: 486677 Size: SH
  3. Remove the relay bracket screws.
  4. Reposition the relay bracket aside.

    5. Object Number: 708587 Size: SH
  5. Disconnect the 2 vacuum lines from the defroster actuator (3).
  6. Disconnect the orange vacuum line from the recirculation actuator and install a hand vacuum pump (2).
  7. Remove the defroster actuator from its attachment to the HVAC module case.
  8. Using the hand vacuum pump (2) open the recirculation actuator door to the full position.
  9. Rotate the defroster actuator to the right and up into the opening between the back of the dash and the opening into the HVAC module.
  10. Disconnect the defroster actuator from the defroster door arm.

Installation Procedure

    Object Number: 708587 Size: SH
  1. Install the defroster actuator to the defroster door arm and snap into place on the HVAC module.
  2. Connect the vacuum line to the actuator.
  3. Remove the hand vacuum pump  (2) and reinstall the vacuum line to the recirculation actuator.

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


    Object Number: 486677 Size: SH
  4. Install the relay bracket screws.

    5. Tighten
    Tighten the screws to 1.0 N·m (89 lb in).

  5. Install the I/P compartment. Refer to Instrument Panel Compartment Replacement in Instrument Panel, Gages, and Console.
  6. Install the right instrument insulator panel. Refer to Instrument Panel Insulator Panel Replacement - Right Side in Instrument Panel, Gages and Console.