Question about 2000 Pontiac Sunfire

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My ac is not cycling - 2000 Pontiac Sunfire

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  • yadayada
    yadayada May 11, 2010

    is the compressor running?

  • Israel Adame
    Israel Adame May 11, 2010

    Is it turning on?

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  • 72 Answers

Most likely low on freon. they wont turn on if they are to low.

Posted on Jun 22, 2009

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Posted on Jan 02, 2017

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1 Answer

What would cause my a/c comp to cycle rapidly at idle it also causes my temp gauge to bounce back & forth


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when you use the front defrost in the winter the cycling of tha a/c compressor will cause this condition.

when you use defrost the a/c is run to de-humidfy the air that is blown onto your windshield.


in the summer this is not a big deal as it is hot enough outside to keep the a/c system pressure above the compressor clutch cycle threshold. but in the winter the general lack of heat in the ambient air and the lack of humidity results in rapid cycling of the ac compressor.

the idle is bumped up to compensate for the load of the a/c compressor, or else your engine would stall out. but when the compressor is disengaged the idle is dropped. but it raises again when the compressor cycles back on.

there may be a good chance that your ac is under charged after all these years. when the weather gets warmer have the charge level in your ac system checked.

a low charge will also increase the on off on off cycling of the ac compressor, usually resulting in the complaint that you have. so the base issue of your problem is low ac system charge.

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