GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 Jimmy - 2WD 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Defroster Valve Actuator Replacement

Removal Procedure
  1. Remove the instrument panel.

    2. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges, and Console.

  2. Disconnect the vacuum hose connector.
    3. 2.1. Slide the tab out of the connector past the L-shaped bend in the actuator vacuum tube.
    2.2. Slide the hose connector off of the tube while you continue to hold the tab back against the connector end.
  3. Remove the vacuum hose connector at the center outlet duct actuator and/or the defroster valve actuator.
  4. Remove the center outlet duct actuator and/or the defroster valve actuator, if necessary.

Installation Procedure
  1. Install the center outlet duct actuator and/or the defroster valve actuator, if necessary.
  2. Install the vacuum hose connector(s).
  3. Install the black hose to the center outlet duct actuator and/or the black/tan hose to the defroster valve actuator.
  4. Connect the vacuum hose connector.
    5. 4.1. Bend back the tab of the connector flush against the end of the connector.
    4.2. Hold the tab in place while you slip the tab and the connector onto the vacuum actuator tube.
    4.3. When the connector is fully seated, pull the tab over the L-shaped bend in the tube in order to hold the connector in place.
  5. Install the instrument panel.

    6. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges, and Console.