It depends on how much the system has been overfilled if it has been, I have seen vehicles that have been so overfilled that the compressor would not turn but if it was say 10 or even 15% overfilled I doubt you would notice. With the price of gas now it would surprise me if it had been.
An A/C specialist would be able to tell if it has been overfilled with some gauges, the pressures will be to high.
Are you sure it is not just a worn belt and?or pulley making a noise with the load?
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