Question about 1999 GMC Suburban

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Blower puts out too many amps

How do I replace blower motor and dashboard control panel on 99 GMC Suburban

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  • d_e_meyer Jan 05, 2009

    A garage did diagnostics and said the motor was putting out too many amps and caused the control unit switch to short circuit. They of course wanted to replace all.

  • jetfixr May 11, 2010

    I smell a rat at that garage. It sounds like they are either replacing everything hoping they hit the right part or there is something I am not seeing. If you throw enough **** on the wall something is bound to stick. Thats not troubleshooting, thats called "shot gunning". I am calling BS on that diagnosis. I would get a second opinion.

    Tell me the symptoms of whats happening and I may be able to help more.

    The motor is pretty straightforward, it should be under the dash by the passengers right leg. Mine is covered by a round bump on the shroud. The instrument panel may be a little more indepth. Its hard to describe it with just words.

    Just to clarify it, the motor uses electricity, it does not produce it. Therefore a motor cannot put out too many amps. You can easily eliminate the motor by running a wire straight from your battery to the terminal on the motor, If it runs, the motor should be good provided it is not really noisy.



    You may be able to find some kind of repair manual at the Library, but if you plan to keep the car I highly recommend buying the factory service manuals from www.helminc.com. They are about $130 last time I checked, but throwing unnecessary parts at the car will cost much more.



    The service manuals have troubleshooting charts and detailed explainations of disassembly. You may be able to find a manual on e-bay.



    There must be some other trustworthy garage around for a second opinion..

  • jetfixr May 11, 2010

    What exactly is the problem? The blower doesn't produce amps, it basically consumes then. Anyway, if you are having a problem with your blower speeds, my 95 suburban has a resister module on the blower housing under the dash. It basically works by reducing the voltage to the motor to control the speeds. With no resistor in circuit, fan runs full speed, One resister is circuit, motor runs mid speed, and 2 resistors, motor runs on low speed.

    It looks like a small plate on the exterior of the housing with a small plug connected to it. I am sure it is much cheaper than either the blower motor or the control panel. Check it out before you spend any money.

  • Anonymous Mar 26, 2014

    Does a 99 GMC Suburban have a "cruise" light indicator on the dashboard?

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I never read that the fuse was blowing in any of the descriptions, but if we are going to jump ahead and suppose the armature is shorted, wouldn't it be easier to just pull the plug off the motor and replace the fuse and turn the motor switch on and see if the fuse pops after we have eliminated the motor. If fuse does not blow, the motor is bad. If fuse blows, you have a short somewhere.

In my experience, armatures usually fail open and the motor simply won't work. I still stand by my suggestion of step by step methodical troubleshooting rather than buying the parts first.

Posted on Jan 07, 2009

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There is too much resistence in making the motor run, ie.friction and cold,dried grease in the bearings and this is equilent to a shorting the brushes on the armeteur which cannot spin fast enough to move from contact to contact internally as it should when running normally. This is what is blowing your fuses. Unfortunaltely, you will have to remove some ductwork and perhaps the glove box to get to the blower motor. You may be able to restore it, if not, ck your local junk yard and compare prices with a new one and if you plan to keep the unit indefinately, you may wish to spring for the new one.
good luck

Posted on Jan 06, 2009

  • Glenn Snow Jan 06, 2009

    Also, once you get to blower motor, be sure to ck the brushes as they may be the culprit; replace them if they are serviceable.

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