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Thread: Heat-AC

  1. #1
    Newbie taco2day's Avatar
    Join Date
    Sep 2011
    SE MN on the Mississippi - God's Country

    Default Heat-AC

    I have noticed lately that my 2003 Silverado will blow AC or heat when neither one is turned on. Yesterday afternoon it was AC (86 degrees air temp), and this morning it was heat (53 degrees air temp). The heat was on cold and the fans was not turned on. Is there a sensor or control module that has gone bad or something else. Like to have an idea before I take it in for diagnosis. Thanks

  2. #2


    Could be a bad fuse but I'm not sure.
    04 ECSB Custom silver & grey, Soft 8's, BFG KO's, ReadyLift Leveling Kit, Hellwig front sway bar, K&N filter, DeeZee EZ-Down, Rhino liner, Alpine CDE103BT, Rockford 6.5's, 12" V.A.T. Hammer Pro in a Subthump box, Alpine PowerPack amp, Hifonics amp, BackRack w/ 55w 5000k HID KC Daylighters, KC light bar with 4 KC Slimlites, UWS toolbox, Shaved Antenna mod, Black Bowtie, LED backup, license plate, dome lights & 3rd brake light

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