Test Description

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

1. 2. This step will determine if one or more blower speeds are inoperative.
2. 3. This step tests for a voltage change in the auxiliary heater or A/C blower motor feed circuit.
3. 4. This step tests for an open in one of the auxiliary heater or A/C blower motor speed control circuits and the auxiliary heater or A/C blower motor switch.
   Fig 1: Auxiliary Blower Motor Malfunction (1 Of 2)

   Courtesy of GENERAL MOTORS CORP.
   Fig 2: Auxiliary Blower Motor Malfunction (2 Of 2)

   Courtesy of GENERAL MOTORS CORP.