Question about 2004 GMC Sierra 2500

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2005 GMC Sierra blower wont turn off

When I turned off my truck. The a/c/heater blower keeps running. The climate control is turned off also. I have to disconnect the battery or take out the fuse. It just started yesterday. It is very cold outside and snowing hard here in Cleveland. But this is the first time this ever happened.

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  • MacDeMan Nov 22, 2008

    How do I find service bulletins? So I can get it repaired? Thanks for the help!

  • Anonymous Dec 13, 2008

    I TURNED OFF MY VEHICLE AND WHEN I RETURNED 1 HOUR LATER MY BLOWER FAN WAS STILL BLOWING AT FULL SPEED. TO STOP FAN I HAD TO REMOVE FUSE. DANGEROUS IF YOU
    LEFT VEHICLE FOR A LONG PERIOD. IS THIS A COMMON PROBLEM..MY VEHICLE IS A 2007 GMC SIERRA 1500 WITH 58000 KM. THANK YOU

  • Anonymous Dec 21, 2008

    2004 tahoe, have similar/same issue. Climate control system. blower not working, when i get to work, it doesn't shut off. found several GM TSB's on this. Voltage is good to control module, including speed control, fan runs ok on 12v direct. everything says it is the control module. remove the plastic cover on passenger side(only loosen screw behind console, remove other 2 ). module is right there. 2 screws, and 2 plugs. easier to take blower out to get to plug. tab in back holds it up-depress tab, 1/8 turn drops blower.

  • Anonymous Jan 04, 2009

    i am having the same problem in the same situations i think it could be the climate control relay

  • Anonymous Mar 26, 2014

    Blower runs on hi all the time even with the key turned off

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Www.motorcity1.com This web site is all you need, it explains everything.

Posted on May 13, 2009

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GM has a service bulletin for this symptom.They say that in cold tempetures the blower control module fails also known as a linear control module. This only applies to vehicles with automatic temperture control.

Posted on Nov 22, 2008

  • SM124 Nov 22, 2008

    Any GM dealer could check for you, Its not a recall and there wasn't much in the bulletin other than saying in cold weather this may happen. It said with the new one the blower speeds may seem stronger than before. I think that this part is the same as the blower resistor on older vehicles. It is probably located in the bottom of the blower housing inside the cab on the passenger side. I think it has a 3 wire plug.

  • Eddie Garver
    Eddie Garver Jul 07, 2014

    Modular on2005 gmc z71 bad , $409.63 for fix, upset

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