GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Start the engine.
  2. Allow the engine to reach normal operating temperature.
  3. Place the blower motor switch in the MED 1 position.
  4. Rotate the temperature selector from COLD to HOT.

The air temperature will change from cold to hot.

Temperature Actuator Inoperative

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