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Great news fellows: swapped out and re-tensioned fan belt and that corrected the issue. Appeared the old belt was stretched, so replaced with new one just in case there were other issues with it......all of the tips here are much appreciated....

Yes, when I turn the AC off the squeal stops......will check my WSM I purchased on ebay....

Thanks and I will give that a try; sure beats the heck out of a 15 -1700 dollar fix given by the dealer.....

Greetings All, I have a 2019 purchased brand new Kubota M6060HFC with 190 hours; when I crank it up and enable AC button, AC appears to cool and run normally. However, when I increase the engine RPM, about half throttle, a high pitched "squeal" appears to come from near AC compressor/belt...