To answer your question, any bearing should make noises when going out. The power steering would make a hum type noise, but I would think that you would also hear it when stationary and run up to the rpm range you hear it at. If it goes away with slight steering influences, and you say it's heard from the passenger side, instinct would lead me to a wheel bearing. It is hard to say, realistically, I can only offer possibilities. If the noise can be duplicated on a lift with the vehicle run up to the speeds the noise occurs at, you might be able to hear it with a stethoscope or some other transmitting device(long screwdriver/prybar). The problem with that, is some bearing noises tend to not be present without the load on them. My approach, if it were in my stall and probability didn't lead me to a conclusive answer, I would use what is called a 'Chassis ear'. It is an electronic device with sensors that can be mounted in various locations, and using a switch box, you can listen to the noise that each sensor is registering. It enables a process of elimination on noises that only happen dynamically.
Wednesday, February 3rd, 2010 AT 1:01 AM