Quote:
Originally Posted by timmahh
Not to discount any noises (I haven't listened yet in mine), but there is at least one fan in the general area, which is in the head unit. No idea if it's variable speed, but if it responds to temperature changes, that may be why some people hear it, others don't, etc. I've heard it kick on in previous gen BMWs. It's very faint, but if there is no other sound you hear it. It's a tiny fan so expect more of a high pitched whine to it. Additionally it's hidden behind the console, which is going to change the sound you hear a bit.
Another possibility could be some voltage electronics back there, maybe a capacitor or something.
Edit: While looking at other components on eBay, the digital has what looks like a blower fan, on the right side when viewing from the front.
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My x5 also has a color AC screen and I can hear the noise.
I’m pretty sure the noise is not coming from the fan. It’s super high frequency and a fan cannot produce it. It might be the voltage electronic in it though. Such a bummer that Bmw won’t acknowledge/fix it.