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Thread: HVAC controls

  1. #1

    Default HVAC controls

    Hi guys, my heater controls stoped working, the fan part only works on 5, when i put it on 4,3,2,1the fan shuts off, do i have to replace the controls? thanks in advance.

  2. #2
    Master Mechanic TritonBoulder47's Avatar
    Join Date
    Nov 2009
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    Tunkhannock, PA (North East)
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    809

    Default

    It's usually not the control head, but the resistor on the blower motor... It's a semi-common thing with GM's...

    Tim a.k.a. Da' Boulder

    2003 Chevrolet Avalanche Z71 - Custom Emergency Response POV

    Firefighter, Fire Policeman, Ambulance Driver, Rescue Tech, Emergency Lighting Installer

    Tint, 20's, Bull Bar, Intake, Exhaust, Billet Grill, Stereo, Custom Console, Emergency Equipment, and the list goes on...

  3. #3
    Legend

    Join Date
    Feb 2008
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    Red Wing, Minnesota, United States
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    3,356

    Default

    ^^^^ X2, its the resistor, cheap fix.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  4. #4
    Jr. Apprentice
    Join Date
    May 2009
    Location
    Ridgecrest, CA
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    14

    Default

    This is amazing. My '96 k1500 started doing the same thing last month. I was about to go and have the control head replaced but thought it weird that it would only work on 5. You guys rule!! I'm gonna pick one up from CLASSIC PARTS. Thanks again.

  5. #5

    Default

    Quote Originally Posted by pipeguy View Post
    Hi guys, my heater controls stoped working, the fan part only works on 5, when i put it on 4,3,2,1the fan shuts off, do i have to replace the controls? thanks in advance.
    i have had the same problem, and just fixed it. heres my post: http://www.gmtruckclub.com/forum/showthread.php?t=35065


    Cody- Tulsa, OK
    '04 silverado

  6. #6

    Default

    what year truck is ? Some of the later model gm's have an electronic resistor thatt goes bad and most of the time takes the connector with it.

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