Question about 2004 Chevrolet Silverado 2500HD

1 Answer

Put my speed control on 5 and runs, turn it to any other setting and instant blown fuse. replaced the resister module next to the blower, checked the harness and blower motor with meter. confused. has to be short between the speed control and the resister

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  • gary clinton Feb 01, 2010

    thought that too, but i unplug the blower and put my meter in the blower connectors and when on high i get 14 volts turn down one and pop goes the fuse. i sholud of just got a lower reading in voltage right?

  • gary clinton Feb 01, 2010

    thanks for the help i will change it in the morning

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  • Chevrolet Master
  • 6,826 Answers

The blower motor is bad,it may run fine on high,but it is pulling to many amps,that is what burned out the resister in the first place,the blower motor does not have to sound,or run bad to cause this.

Posted on Feb 01, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Feb 01, 2010

    No,only if the speeds where working correctly,when dropping the speed down,the wiring is routed threw the resister,witch heats up the resister,backs up the voltage.When this happens,it requires more amps to run the motor,because the motor is going bad,field,or bushings,what ever is loading the motor.On high,it will hold the amps,cause there is no resister involved.High never goes out,because it bypasses the resister,change the blower motor.

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1

Did you perform the Diagnostic System Check - Vehicle?
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Go to Step 2
Go to Diagnostic System Check - Vehicle

2

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Test the ground circuit of the blower motor control processor for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
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Go to Step 6

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Important: Ensure that the blower motor control processor connector and the HVAC control module connectors are connected during this step in order to avoid misdiagnosis.

  1. Measure the voltage from the blower motor speed control circuit at the HVAC control module to a good ground.
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Does the voltage measure near the specified values?
5 V OFF
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7

  1. Turn OFF the ignition.
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Refer to Circuit Testing and Wiring Repairs .
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