Not sure, just offering some input here. Try turning the fan speed to a different setting. If the fan is on high and the engine's idling and your foot is on the brake and the AC is on, there's gonna be a limited amount of power from the alternator. That can cause the fan to make an unusual noise (it's done it on older vehicles I've owned anyhow). I always just figured it was lower system voltage causing a higher current draw at the fan. Turning the fan down one or two speeds always cured it for me. Or tossing it in neutral and giving it a few RPMs.
Air Conditioning Noise
My Malibu seems to have an intermittent noise that I think is coming from the a/c compressor when the car comes to a stop or is idling. It seems to be a woffiling sound (if that makes any sense) I noticed when the rpm drops below 1000 it seems to do it more. I only notice it from inside the vehicle and not when I pop the hood and the a/c compressor is running.
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