Test Description

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table

3. This step tests for a blower motor that does not operate regardless of the desired blower motor speed.
4. This step tests for a blower motor that operates, yet does not accurately respond to the desired blower motor speed.
5. The HVAC control module is inoperative when the it does not respond to any operator requests.
This step verifies that there is power to the HVAC control assembly.
13. The voltage will vary between 0-5 volts during normal operation. The HVAC control assembly connector must be connected during this step.

Fig 1: Air Delivery Improper Diagnosis (Steps 1-10)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Air Delivery Improper Diagnosis (Steps 11-19)

Courtesy of GENERAL MOTORS CORP.

Fig 3: Air Delivery Improper Diagnosis (Steps 20-23)

Courtesy of GENERAL MOTORS CORP.