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Message: <blockquote data-quote="Bruce" data-source="post: 701765" data-attributes="member: 256301">I turn the ac on. Please help.? The compressor will not turn on when the ac button is pressed.I have ruled out low freon by jumping out the pressure switch on the accumulator. Does anyone know how the ac temp switch works.? How can I tell if it is bad? Also when I hit the ac button on the dash I can hear a relay pulling in and have traced it to a vacuum/electrical valve. I need to know what controls the voltage to the compressor basically.  Thanks  Bruce</blockquote>