spanionneo 3/19/2013There are two Wheel bearing hubs in the front, and sometimes the echo of sound makes it appear to be one side when it's really the other. Bottom line, you never want to change a hub unless you're certain it's damaged by checking it for grinding or looseness. There are other reasons why you maybe hearing roaring noise. It could be worn tires, cupped, and it mimics the sound of a bad wheel bearing. Look for flat spots on tire or simply start rotating your tires diagonally...driver front to passenger rear and vice versa for both sides. Check to see if the noise is speed dependent or all times. Whether if certain transmission gears that cause it to come on....Listen in engine compartment for possible worn components such as a compressor etc....bottom line, stop replacing and start collecting evidence.
neomyejohn 3/20/2013You should try replacing all the bearings and ensure that they sre tightly fitted. If this does not stop, then you should definitely visit a mechanic. Maybe this problem is originating from some other part of your car and you might have no idea.