GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1998 🢒 Silhouette Ext. 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Mode Valve Actuator Replacement

Removal Procedure
  1. Remove the left instrument panel insulator. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gauges and Console.
  2. Remove the knee bolster from the instrument panel. Refer to Knee Bolster Replacement in Instrument Panel, Gauges and Console.
  3. Disconnect the vacuum lines from the mode valve vacuum actuator.

    4. Object Number: 295281 Size: SH
  4. Cut the tie strap (1) that is on the back side of the mode valve vacuum actuator.

    5. Object Number: 295288 Size: SH
  5. Lift to release the mode vacuum actuator retaining tab and just begin to slide the vacuum actuator toward the steering column.
  6. Rotate the mode valve lever fully forward (counterclockwise) and hold in place until instructed.
  7. Carefully rotate the vacuum actuator toward the front of the vehicle until the actuator is released from the mounting pins on the HVAC module case.

    8. Object Number: 295292 Size: SH
  8. Extend the vacuum actuator below the HVAC module case mounting pins, then slide the vacuum actuator rearward in vehicle, past the pins.
  9. Disconnect the vacuum actuator pushrod from the mode valve lever and remove the vacuum actuator.
  10. Release the mode valve lever.

Installation Procedure

    Object Number: 295292 Size: SH
  1. Fully extend the mode valve actuator pushrod.
  2. Rotate the mode valve lever fully forward (counterclockwise) and hold in place until instructed.
  3. Connect the mode vacuum actuator pushrod to the mode valve lever.

    4. Object Number: 295288 Size: SH
  4. With the vacuum actuator below the HVAC module case mounting pins, slide the vacuum actuator forward in the vehicle, past the pins.
  5. Carefully rotate the vacuum actuator toward the rear of the vehicle until the actuator slots engage onto the mounting pins on the HVAC module case.
  6. Check that the vacuum actuator pushrod is not binding on the mode valve lever.
  7. Push the vacuum actuator toward the HVAC module case to secure the retaining tab.
  8. Release the mode valve lever.

    9. Object Number: 295281 Size: SH
  9. Install a new tie strap (1) to the base of the mode vacuum actuator.
  10. Connect the vacuum lines to the actuator.
  11. Install the knee bolster. Refer to Knee Bolster Replacement in Instrument Panel, Gauges and Console.
  12. Install the left instrument panel insulator. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gauges and Console.