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 tests for blower motor operation in any speed setting.
3) - This step tests for voltage at the blower motor.
4) - This step tests for a possible open in the blower motor ground circuit.
5) - This step tests for output voltage from the blower motor switch.

Fig 1: Blower Motor Inoperative Diagnosis (Steps 1-7)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Blower Motor Inoperative Diagnosis (Steps 8-15)

Courtesy of GENERAL MOTORS CORP.