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Fan always on with A/C

Discussion in 'Peterbilt Forum' started by Canary379, May 26, 2016.

  1. May 26, 2016 #1
    Canary379

    Canary379 Light Load Member

    64
    3
    Apr 13, 2012
    Illinois
    0
    Hello forum brothers... I am looking to troubleshoot an a/c issue i have. The truck is an 2001 379 with a C12 and when i turn the a/c on the fan comes on and stays on.

    This is obviously robbing me of both fuel and power and need to get it fixed. Aside from taking it to the dealer i wanted to see if it was anything that I could do myself and save the labor cost.

    What could the cause of this be? i appreciate your help and hopefully can get this taken care of soon.

    thanks
     
    Canary379, May 26, 2016
    Canary379, May 26, 2016
    #1
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  3. May 26, 2016 #2
    beemergary

    beemergary Light Load Member

    229
    112
    Apr 11, 2014
    0
    Your trinary-binary switch goofing up or did someone wire it into fan switch?
     
    beemergary, May 26, 2016
    beemergary, May 26, 2016
    #2
  4. May 26, 2016 #3
    AModelCat

    AModelCat Road Train Member

    27,729
    145,300
    Jul 7, 2015
    Canuckistan
    0
    Is your condensor clean? If its plugged up the fan will run to try and bring the high side A/C pressure down.
     
    AModelCat, May 26, 2016
    AModelCat, May 26, 2016
    #3
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