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.

2) - This step will determine if one or more of the blower speeds is inoperative.
3) - This step determines if there is battery positive voltage at the blower motor resistor assembly.
4) - This step tests for voltage in each blower motor control circuit.
5) - This step tests for an open in the blower motor resistor assembly.

Fig 1: Blower Motor Malfunction Diagnosis (Steps 1-6)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Blower Motor Malfunction Diagnosis (Steps 7-11)

Courtesy of GENERAL MOTORS CORP.