car is stationary??
If the noise is still there when the car is not moving but the engine is running it won't be wheel bearings.I have heard of noise coming from worn a/c compressor,alternator or power steering belts and/or bearings in the same.If the noise varies with R.P.M. I would look into this area.See if you can find where the noise is coming from under the bonnet (er sorry, hood for you yanks).
aussie '98 legend man