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A/C switch not working

Discussion in 'Peterbilt Forum' started by Excorcist1, Apr 12, 2013.

  1. Apr 12, 2013 #1
    Excorcist1

    Excorcist1 Light Load Member

    222
    39
    Jan 11, 2012
    Chestertown, MD
    0
    Thought I must had needed freon, but learned that the a/c comp. clutch wasn't kicking in. If I hook 12v up to the plug @ compressor it kicks on and the a/c works. Switch on dash lights up when pushed on. But evidently no power is coming from dash to compressor. Volt meter showing only .3 volts getting through. Where do I start or should I say go from here?
     
    Excorcist1, Apr 12, 2013
    Excorcist1, Apr 12, 2013
    #1
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  3. Apr 12, 2013 #2
    snowwy

    snowwy Road Train Member

    20,554
    13,281
    Jul 6, 2009
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    look at the low side pressure switch. make sure power is getting to that point. if so, try a paper clip in the plug to see if compressor kicks on. if not. problem is between low switch and conmpressor. electrical issue, if you gots no power at the plug. probably could be dash switch or a relay somewhere.

    the low pressure switch has a blue cap on the freon connector. trace that line to the switch.
     
    snowwy, Apr 12, 2013
    snowwy, Apr 12, 2013
    #2
    Excorcist1 Thanks this.
  4. Apr 12, 2013 #3
    nasriza

    nasriza Road Train Member

    2,397
    2,070
    Feb 1, 2013
    Chicago, IL
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    What kind of truck is this
     
    nasriza, Apr 12, 2013
    nasriza, Apr 12, 2013
    #3
  5. Apr 12, 2013 #4
    Blind Driver

    Blind Driver Road Train Member

    3,081
    1,406
    Aug 7, 2006
    New Albany, IN
    0
    Check the fuse :biggrin_25526:
     
    Blind Driver, Apr 12, 2013
    Blind Driver, Apr 12, 2013
    #4
  7. Apr 13, 2013 #5
    Excorcist1

    Excorcist1 Light Load Member

    222
    39
    Jan 11, 2012
    Chestertown, MD
    0
    Yeah I was wondering if there was a relay/plug between the dash switch and the 1 at the compressor. Okay thanks I'll give it another shot today
     
    Excorcist1, Apr 13, 2013
    Excorcist1, Apr 13, 2013
    #5
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