I have a situation. My car has developed a noise that sounds like whirrring. It seems to be noticeable at 40-85mph. I also feel it in the steering wheel. I thought it was a wheel bearing so I took off all the wheels and tried moving them (hands at 12 and 6). I didn't feel any shaking so I took the car in for a tire rotation, alignment, and balancing. The sound remains...any one have any advice or further tests?