GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

The mode valve actuator is located on the bottom front corner of the heater 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 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 mode valve.

  6. Object Number: 394087  Size: SH
  7. Remove the mode valve from the heater module.

Installation Procedure


    Object Number: 394087  Size: SH
  1. Install the mode valve to the heater module.

  2. Object Number: 394104  Size: SH
  3. Install the vacuum connectors to the mode valve.
  4. Ensure that the retaining clip locks into place.

  5. Install the center instrument panel sound insulator. Refer to Closeout/Insulator Panel Replacement - Center in Instrument Panel, Gauges, and Console.
  6. Install the knee bolster. Refer to Knee Bolster Replacement in Instrument Panel, Gauges, and Console.
  7. Install the left side instrument panel sound insulator. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gauges and Console.