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1999 Mercury Marquis air conditioner blows hot air. did red dye leak test. ck'd all fuses and relays. recharged but still blows hot air. could it be one of the two switches?

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Yes it could be, do an resistance and continuity check on each switch to see if one is malfuncting. it could also be the wiring to the compressor high and low preasure switches. if the system is still low opr over filled on refrigerant the low or the over Psig. preasure switch will not alow the compressor clutch to engage, or will try to than disengage quite quickly to protect the system. you need to get a gauge set hooked up to the high and low side of the compressor to get actual readings to know if the system is low , high or in between operating perameters.

Posted on Jul 31, 2009

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