Test Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. 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) - 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 1-9)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Air Delivery Improper Diagnosis (Steps 10-17)

Courtesy of GENERAL MOTORS CORP.

Fig 3: Air Delivery Improper Diagnosis (Steps 18-23)

Courtesy of GENERAL MOTORS CORP.