GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Start the vehicle.
  2. Turn the blower switch to the LOW position
  3. Turn the mode door switch to the MAX A/C position.

A/C compressor clutch engages.

A/C compressor clutch does not engage.

Refer to:

2

Turn the mode door switch to the OFF position.

A/C compressor clutch disengages.

A/C compressor clutch does not engage.

Refer to:

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.