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Thread: Heat/AC Control Question....What do you think????

  1. #1
    Join Date
    May 2015
    Location
    Springfield MO
    Posts
    40

    Default Heat/AC Control Question....What do you think????

    Just recently got my A/C up and running. I have a question for all of you. My A/C is nice and cold and works great on low fan speed and medium fan speed, however, I have no high fan speed at all. It acts like a bad switch. I'm considering swapping out my Heat/AC control unit in the dash.


    YOUR THOUGHTS IF THAT'S A GOOD IDEA?

  2. #2
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: Heat/AC Control Question....What do you think????

    There are three things you need to check. The switch, which can go bad. The connections on the back and associated wiring and third the ballast resistor on the HVAC housing. Your selector will be OK. There is a lot of current, full current that goes through the switch on all speeds. Having the switch or resistor get toasted is a common problem
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  3. #3
    Join Date
    May 2015
    Location
    Springfield MO
    Posts
    40

    Default Re: Heat/AC Control Question....What do you think????

    I hate to be a pain, but can you give a more detailed description of where the ballast resitor is located?

  4. #4
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: Heat/AC Control Question....What do you think????

    It will be shielded, but look at the HVAC housing directly below the glove box
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

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