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      11-28-2020, 12:23 AM   #6
calbear550
Second Lieutenant
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Drives: 2020 M5, 2020 X4MC (retired)
Join Date: Nov 2013
Location: los angeles

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I had some whistling from the drivers side rear a/c vent right that's located right by the drivers ear. I had it closed and the rear a/c was on low-medium. I could hear it slightly with the radio off. Opening the vent or turning the rear a/c fixed it. Not sure if that's what you're experiencing, but worth a shot.
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