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Heat-AC

Discussion in 'General Chevy & GM Tech Questions' started by taco2day, Sep 13, 2011.

  1. taco2day

    taco2day New Member

    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. TELORVEHC

    TELORVEHC New Member 1000 Posts 100 Posts

    Could be a bad fuse but I'm not sure.

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