What will cause an intermittent squeal when the Air Conditioner is in use?

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Sounds like belts slipping, but belts are replaced and tight. The squeal will stop when AC button turned off and run fan only, or terminate AC & Fan, or when the clutch is pressed in. The squeal is intermittent every few minutes, mostly while driving, but will squeal when running idle after start up and is only while AC is turned on. AC runs good, is cold.