GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  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 knee bolster. Refer to Knee Bolster Replacement in Instrument Panel, Gauges and Console.
  3. Remove the center instrument panel sound insulator. Refer to Closeout/Insulator Panel Replacement - Center in Instrument Panel, Gauges, and Console.

  4. Object Number: 394104  Size: SH
  5. Depress the retaining clip in order to remove the vacuum connectors from the defroster valve.

  6. Object Number: 394087  Size: SH
  7. Remove the defroster valve from the heater case.

Installation Procedure


    Object Number: 394087  Size: SH
  1. Install the defroster valve. Ensure that the retaining clip locks into place.

  2. Object Number: 394104  Size: SH
  3. Install the vacuum connectors to the defroster valve.
  4. Install the center instrument panel sound insulator. Refer to Closeout/Insulator Panel Replacement - Center in Instrument Panel, Gauges, and Console.
  5. Install the knee bolster. Refer to Knee Bolster Replacement 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.