Thread: A/C Turns on when i switch to defrost

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  1. #1 A/C Turns on when i switch to defrost 
    SE Level Member Blacknight02GT's Avatar
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    Okay, so tonight i noticed while i was driving home that when i turn my front defrosters on the A/C kicks on. It doesn't matter if push the A/c button or not. Is this some sort of random electrical issue? Has this ever happened to anyone, if so How do i fix this, I don't want to ruin my A/c compressor in winter months.
    2002 Grand Prix GT (K&N + Ram Air = BEAST)
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  2. #2 Re: A/C Turns on when i switch to defrost 
    GrandPrix Junkie Sabrewings's Avatar
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    All cars are like that. The compressor helps dry the air so it doesn't further fog up the windows. In the winter if the outside temp is below a certain point the AC compressor won't kick on no matter what you do. You don't have to worry about messing it up.
    2004 Impala LS - got some mods sold!!!
    2009 Subaru Impreza WRX STI

    NAIOA moderator Still Imp'n, just in a different Imp.
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  3. #3 Re: A/C Turns on when i switch to defrost 
    SE Level Member Blacknight02GT's Avatar
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    hmm.... I feel like such an idiot! I kinda thought that for a minute, but then i never remembered it doing that before. Makes sense actually.
    2002 Grand Prix GT (K&N + Ram Air = BEAST)
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  4. #4 Re: A/C Turns on when i switch to defrost 
     

  5. #5 Re: A/C Turns on when i switch to defrost 
    Donating Users mystic231's Avatar
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    ....seriously?
    Seriously. At temps above 38 degrees the A/C compressor kicks on in defrost mode. It's automatic.
    '98 Bright Red GT 278,000 miles and counting...
    '02 Galaxy Silver GTP GMPP Suspension, F Body front brakes, TDC FWI intake, Ported M90, Intake, and Throttlebody, Overkill PCM
    '02 Bright Red GT
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  6. #6 Re: A/C Turns on when i switch to defrost 
    DUI BABY Bio248's Avatar
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    i know. was referring to the question. i usually turn on my defrost setting for the front window if i just want to keep the car kinda cool.
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  7. #7 Re: A/C Turns on when i switch to defrost 
    i pay to play badbrad's Avatar
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    is this a joke? omg. if the a/c compressor comes on with the rear window defogger, now that's a problem!lollolololololoolllll
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