just happened. It is not driven often
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1995 Mercury Villager Question: ac compressor not turning on
Answer #1patrick mannion from Greg Solow's Engine Room, March 19, 2010, 08:51Master
The air conditioning system has a low pressure switch which prevents the system from engaging the compressor if the system is low in refrigerant to save the sytem from damage. If the clutch on the compressor, electrics or fuses fail that could also stop the system form turning on.