GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

Turn the mode switch to the OFF position.

The blower motor remains OFF.

Blower Motor Always On

2

  1. Turn the ignition switch to RUN position.
  2. Turn the mode selector switch to the DEF position.
  3. Cycle the blower switch from LOW to HIGH.
  4. Repeat Step 3 for the following modes:
  5. • BLEND
    • HEAT
    • VENT
    • BI-LEVEL

The blower motor operates in all positions.

Blower motor inperative in one mode: Go to Control Assembly Replacement

3

No abnormal results were found while performing the System Check.

The system is OK.

The customer complaint is not resolved. Go to Intermittents and Poor Connections Diagnosis

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