GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn the ignition switch on.
  2. Set the blower switch to the off position.

The blower motor is off.

Blower Motor Always On

2

Turn the blower motor switch to LO, MI, M2, M3, and HI positions.

The blower motor operates at increasingly faster speeds.