I drive a 2000 328i with 90000 miles on it. On Thursday I heard the power steering fluid noise- loud groans, popping, and a slight grinding feel in the wheel. I purchased Castrol Dexron III ATF and filled the Power Steering reservior to the specified fill... problem solved? Not really. Tonight (Saturday night) the noise came back. I checked the reservior and it is bone dry again. I have owned the car for almost 6 months now, no problem until now.
Oddly, I park in the same place at home and at work each day and I see no signs of leakage.
What is the problem and how much will this cost me?
Thanks for your help!