Question about 2001 Chevrolet Silverado

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Blower fan only works on high

I have a 03 chevy silverado the fan for the heat/ac now only works on high or number 5 nothing at all on speeds 1 thru 4 i checked all the fuse in the dash and under the hood they are all good wondering what to do now the control switch? blower motor? couldn't find a relay that looked like it had anything to do with the heat/ac

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  • Anonymous Mar 09, 2009

    I have the same exact problem. Mine is an 04.

  • Anonymous Mar 12, 2009

    Fan switch on my 2003 Trailblazer only works on 5, dealer want $250.00 to fix.

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If it is working at all then the relay and fuse is good and the problem is either the little vacuum hose on the back of the control switch panel or the panel itself.

Posted on Feb 01, 2009

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2004 Chevy Silverado 2500HD ac stopped blowing we changed motor and resistor and still nothing we have cold air running when u drive down road but no pressure


I'm going to assume you have the manual control version. The relay in the resistor allows the fan to run on high and bypass the resistor circuits. There is a 40amp blower fuse for high speed and a 30amp fuse for the other speeds. The motor is grounded thru the resistor.
Do you have power and ground at the motor on any of the settings ? ?

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My fan blower will not work on high speed on my chevy 2005 silverado


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Likely the blower motor resistor. located right next to the blower motor, this device is resposible for reducing the voltage suplied to the motor. when it fails you may loose some or all speeds of the motor

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A bad blower motor resistor will cause it. It is located ny the blower motor p.s. below dash.

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The blower motorresister is bad. It controls the blower speeds for low, medium speeds. It is in the air stream of the blower plenum, usually under the hood on the passenger side at the fire wall.

Usually held in with 2 screws and has a wire connector with 4 or 5 wires in it. You can do this repair. Part is available at most auto stores.

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