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 identifies if the HVAC control module is commanding the blower motor to operate at HI speed.
5) - This step verifies that power is being supplied to the blower motor.
6) - This step tests for a possible open in the blower motor ground circuit or for a poor motor.

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

Courtesy of GENERAL MOTORS CORP.

Fig 2: Blower Motor Inoperative Diagnosis (Steps 7-15)

Courtesy of GENERAL MOTORS CORP.