As in a constant whirring sound after I parked for hours and hours and continuing as I drove in the morning and could hear while driving. It was noticeably different than normal behavior. I called in to Tesla and they did some things on their end to try to pull data from the car and they said they identified the issue and to take the car in. They contacted the local service center and got me setup and sent them the info. It was not in relation to charging.