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Does the drive move if you try turn it manually, if it does not strip the unit and check the bearings. If the motor and vanes are seized the air will just vent out of the exhaust. If it turns, Dismantle the trigger and air inlet valve and check that for sticking, leaking or broken parts.
IT'S MOST LIKELY THE START RELAY/OVERLOAD PROTECTOR ON THE SIDE OF THE COMPRESSOR. UNPLUG UNIT AND PULL START RELAY OFF AND SHAKE. IF SOUNDS LIKE IT'S FULL OF GRAVEL IT'S BAD, OR GET VOLT /OHM METER AND CHECK CONTINUITY BETWEEN THE START AND RUN TERMINALS ON BACK SIDE OF RELAY, WHILE YOUR THERE CHECK CONTINUITY BETWEEN THE BACK SIDE OF OVERLOAD AND WHERE L1 WIRE COMES IN FROM THE HARNESS. IF ALL THAT CHECKS OUT THE COMPRESSOR MIGHT BE BAD OR DRAWING TOO MUCH CURRNET FOR THE FACTORY START DEVICE. YOU DIDN'T NOTE A SERIAL #, SOME OF THOSE MODELS WERE UNDER RECALL FOR THE RELAY/OVERLOAD PROBLEM.
mcdevito75 here, I think your speaking of the air conditioning, it is charged from the low side, if the compressor will not come on you"ll most likely need freon, the compressoe must be on to check it"s operation.