So I have a 2009 328i (automatic) that has been giving me this whining noise every so often. It only happens after I have driven some amount of distance (greater than 40 miles or so), and it doesn't happen every time (more like once every 4 or 5 times I drive it that far).
But when it does, it definitely sounds like something is seriously wrong. The noise can be heard inside the cabin, although it is much louder outside. The noise is loudest when I am stopped at a light and lessens when I accelerate.
Also, when I am hearing the noise and I am stopped at a light, the car will intermittently shake (almost like its going to stall). This only happens when the whining noise is present.
Does anyone here know what the problem here is?
I am attaching a video i took where you can hear the sound, inside and out
Whining noise outside:
http://youtu.be/-PbbkWAzDBA
Whining noise inside:
http://youtu.be/DfSuqOxuEd8