GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 Sonoma Pickup - 4WD 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 Defroster Valve Replacement

Removal Procedure

The defroster valve actuator is located on the bottom left side of the heater/vent module.

  1. Remove the left side instrument panel sound insulator. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gauges and Console.
  2. Remove the center instrument panel sound insulator. Refer to Closeout/Insulator Panel Replacement - Center in Instrument Panel, Gauges and Console.

    3. Object Number: 514707 Size: SH
  3. Disconnect the vacuum connector (3) from the defroster actuator (4).
  4. Remove the actuator rod retaining clip (1).
  5. Remove the actuator rod (2) from the defroster valve lever (5).

    6. Object Number: 514730 Size: SH
  6. Firmly pull on the defroster actuator in order to remove the actuator from the heater/vent module.

Installation Procedure

    Object Number: 514730 Size: SH
  1. Install the defroster actuator. Ensure that the retaining tab locks into place.

    2. Object Number: 514707 Size: SH
  2. Install the actuator rod (2) to the defroster valve lever (5).
  3. Install the actuator rod retaining clip (1).
  4. Connect the vacuum connector (3) to the defroster actuator (4).
  5. Install the center instrument panel sound insulator. Refer to Closeout/Insulator Panel Replacement - Center in Instrument Panel, Gauges and Console.
  6. Install the left side instrument panel sound insulator. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gauges and Console.