[mr_clueless]

I have an issue with an intermittent whistling noise with my 2015 328i.

The video in question is here:
https://dl.dropboxusercontent.com/u/...6/whistle2.mov
It is just over a minute long.

It starts out with a steady whistle (I'm just leaving my home).
The whistling sound wavers at 0:19-0:25.
I pull over and stop the car at 0:42, whistle stops.
Restart at 0:45, no whistle.
Whistle starts back again at 1:04 while still idling.

I posted this on bimmerfest, but wasn't able to get any clues. Right now the car has been with the dealer for 2 days and all they say is that they are unable to reproduce it.

Has anyone else experienced this?

Thanks.

[RoundelM3]

It's the dilithium crystals, cap'n! They're o'erheatin' and I dinna think they can take much more!

Seriously, it sounds like it may be something coming through from your sound system, although it's difficult to tell from the video. It could also be the ventilation fan - I've had a couple of cars (E46 and E92) where this will whistle under certain conditions (cold weather, low fan speed, etc.).