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There can be quite a few reasons as to why the compressor is squealing when the a/c is activated. The most common cause is a loose accessory drive belt (or serpentine belt on some vehicles). Another cause is a loose or weak a/c clutch or possibly a faulty or defective compressor. Try tightening or replacing the accessory drive belt/serpentine belt. If that does not work, have compressor checked at a qualified repair facility.

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