ANSWERS: 2
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The "Heater Valve" being open allowing hot water to circulate & also blow out when AC is on. John
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It could also be that your compressor clutch is not engaging. Turn on the A/C and look at the compressor. If the clutch is sitting idle and not spinning, then you either have a faulty clutch, or clutch relay. Another culprit may be that your blend door is stuck closed or open in the HVAC case.
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