Good evening all! About a week ago, i started hearing this wierd humming or whinning sound coming from my 1993 320i. It gets louder as you pick up speed, and quieter when you slow down. Its hard to describe the sound, its just a constant higj pitched sound that has never been heard before. It has increasingly gotten louder too. Any ideas on what it could be? Your help is greatly appreciated. I tried to search for something similar on the threads, and didnt find anything.