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

Removal Procedure
  1. Remove the left side instrument panel sound insulator. Refer to Instrument Panel Sound Insulator Replacement in Interior Trim.
  2. Disconnect the park brake release cable from the park brake assembly. Refer to Park Brake Release Cable Replacement in Brakes.
  3. Remove the knee bolster. Refer to Knee Bolster Replacement in Interior Trim.
  4. Remove the center instrument panel sound insulator. Refer to Instrument Panel Sound Insulator Replacement in Interior Trim.
  5. Remove the vacuum connectors from the defroster valve.
  6. Remove the defroster valve from the heater case.

Installation Procedure
  1. Install the defroster valve if removed.
  2. Install the vacuum connectors to the defroster valve.
  3. Install the center instrument panel sound insulator. Refer to Instrument Panel Sound Insulator Replacement in Interior Trim.
  4. Install the knee bolster. Refer to Knee Bolster Replacement in Interior Trim.
  5. Connect the park brake release cable from the park brake assembly. Refer to Park Brake Release Cable Replacement in Brakes.
  6. Install the left side instrument panel sound insulator. Refer to Instrument Panel Sound Insulator Replacement in Interior Trim.