GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the ignition switch to the ON position.
  2. Move the blower speed selector switch to the following positions in the following order:
  3. 2.1. LOW
    2.2. M1
    2.3. M2
    2.4. HIGH
    2.5. LOW
    • The blower motor speed increases as the blower speed selector switch is moved toward the HIGH position.
    • The blower motor speed decreases as the blower speed selector switch is moved toward the LOW position.
    •  Blower Motor Always On

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