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Mysterious high pitched whine in front

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Just a half hour ago I suddenly heard a high pitched whine - as from a small electric motor - coming from the front, heard loudest when I crouch by either of the front wheels. The noise continues steadily whether parked or driving.

I have an appointment at Tesla Service Wednesday, but wonder if anyone else has heard such a thing?
 
My coolant pump started running 24-7 whenever it is parked with more than ~75% battery charge last year so it's been on essentially all of the time when plugged in. It's probably part of the batterygate mitigation efforts, they made all kinds of changes to bring down battery temps.