Bearing noise = toast. Not sure about the W210 fans if they can be serviced or not. I know the 126 can be serviced by drilling out a couple of rivets. My fan ran, but howled like a banshee. New bearings shut it right up and been fine ever since. 3.2V may or may not be enough power to break the motor free, assuming it actually is providing 3.2V. I guess you'll find out with the new fan.