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Re: AC compressor noise
remember it is a pressurized system, so even if it leaks, air is not likey to get in easily. i would think the easyest way air could get in the system is improper servicing, not evacuating the system fully or a contaminated gauge set/equipment. if the sound is a whine, then i would look at the clutch/bearing, if it is more of a tapping noise, then it may be the reed valves(assuming the VD style has reed valves) i almost distoryed some reed valves one time by charging to fast and leting liquid refrigerent into the compressior.
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