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Q: air conditioner squealing on 2000 Mitsubishi Montero Sport

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My air conditioner has started to produce a loud squealing noise when turned on. Running the fan alone does not cause the noise. What's the cause?
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For anyome with this problem per mechanic 9 timrs out of ten eithet new belt or just needs to be tightened. My Mitsubishi montero sport was doing the same exact thing until Saturday. .took it to shop it was a horrible squeal. .the air belt was loose cost me $15.00 ...good luck.
It likely to be related to the AC drive belt. That would be the first thing to check. An old belt can produce a squealing noise.
Could be something as simple as the a/c belt out of adjustment. Worst case scenario probably would be the a/c compressor clutch or the compressor itself going bad, which is somewhat common on these.
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