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Nope. An exhaust leak sounds like a tick. You have more of a squeal.
I would check your pullies for wobble, belts for tension, even movement of the motor mounts under that slight torque.
It did once sound like it was coming from the compressor for my aftermarket A/C which is brand new. Could it just be belts need tightening? They have to use a lot of spacers to get everything to line up right.