Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
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If the AC is not engaging automatically but the compressor clutch does engage when you manually power the clutch, I would first be interested in evacuating the refrigerant and recharging with a proper machine scaled charge and see how it does afterward. Any time the refrigerant is more than 20% low or displaced by air the system will disengage the compressor to prevent damage. Note that adding top-up cans will not work here... you need to evacuate it and recharge it by machine on this model to avoid problems.