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Defroster and A/C question

Discussion in 'Trucks [ Eighteen Wheelers ]' started by mark1781, Feb 26, 2015.

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  1. Feb 26, 2015 #1
    mark1781

    mark1781 Bobtail Member

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    Feb 2, 2015
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    A friend and I have a debate going about how,when he turns off the a/c switch and turns on the defroster vent with the tempature control to hot,his a/c compressor kicks on and off.I told him there is something wrong with his system.he says theres something wrong with my truck.we both have the same truck,T2000 Kenworth...what do you all think?who's right.
     
    mark1781, Feb 26, 2015
    mark1781, Feb 26, 2015
    #1
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  3. Feb 26, 2015 #2
    Dirty-Low-Walker

    Dirty-Low-Walker Medium Load Member

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    I always thought that when the defroster is set in the ON position the compressor kicks on.
     
    Dirty-Low-Walker, Feb 26, 2015
    Dirty-Low-Walker, Feb 26, 2015
    #2
  4. Feb 26, 2015 #3
    Cetane+

    Cetane+ Road Train Member

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    Sep 29, 2013
    Albany, NY
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    The A/C "turns on" when the defrost is on. The reason is, when cooling air it condenses the water vapor, thus sending "dryer" air to the windshield to defog faster.
     
    Cetane+, Feb 26, 2015
    Cetane+, Feb 26, 2015
    #3
  5. Feb 26, 2015 #4
    mark1781

    mark1781 Bobtail Member

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    Feb 2, 2015
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    Well im going to investigate this myself because i told him when the a/c button is in the off position,its off.but mabey im wrong.
     
    mark1781, Feb 26, 2015
    mark1781, Feb 26, 2015
    #4
  7. Feb 26, 2015 #5
    inakroofing

    inakroofing Bobtail Member

    2
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    Feb 26, 2015
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    How do i post a new thread?
     
    inakroofing, Feb 26, 2015
    inakroofing, Feb 26, 2015
    #5
  8. Feb 26, 2015 #6
    mark1781

    mark1781 Bobtail Member

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    Feb 2, 2015
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    Roger that Cetane,
    Inakroofing,to post a new thread,on tapatalk app,top right corner,click on dropdown menu,post new topic.
     
    mark1781, Feb 26, 2015
    mark1781, Feb 26, 2015
    #6
  9. Feb 26, 2015 #7
    Ezrider_48501

    Ezrider_48501 Road Train Member

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    Apr 2, 2011
    bismarck, nd
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    the ac is supposed to kick in on the defrost setting regardless of the ac switch. the reason for this as previously mentioned is to dry/de-humidify the air
     
    Ezrider_48501, Feb 26, 2015
    Ezrider_48501, Feb 26, 2015
    #7
    Cetane+ Thanks this.
  10. Feb 26, 2015 #8
    mark1781

    mark1781 Bobtail Member

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    Feb 2, 2015
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    Thanks everyone for your input.i guess im being proved wrong.honestly ive never paid atention to that.it just didnt make sence to me until now.
     
    mark1781, Feb 26, 2015
    mark1781, Feb 26, 2015
    #8
  11. Feb 26, 2015 #9
    Cetane+

    Cetane+ Road Train Member

    1,304
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    Sep 29, 2013
    Albany, NY
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    Thats the word I was looking for
     
    Cetane+, Feb 26, 2015
    Cetane+, Feb 26, 2015
    #9
  12. Feb 26, 2015 #10
    uncleal13

    uncleal13 Road Train Member

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    Apr 9, 2009
    Humboldt, Sk
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    I wish I could disable that function on my Western Star. I don't need the a/c trying to dry my air on the inside of my windshield, while at the same time cooling the defrost temperature, when I'm trying to melt ice fog off the outside of the window while it is -34 outside.
     
    uncleal13, Feb 26, 2015
    uncleal13, Feb 26, 2015
    #10
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