This afternoon when I started my M3 there was a whirring noise that was pretty audible from the cabin. I've never heard the noise before, but I thought maybe it was just the car warming up. I drove it around for a few miles, and the noise was mostly consistently there, but disappeared for a few seconds at a time. I captured it on video:
Any idea what it could be? My mechanic is closed for the holidays so I won't be able to take it in for another few days.