Yes, it could be your wheel bearing. If it sounds like an air plane jet engine, then that's most likely what it is.
But keep in mind, it could also be something loose and rubbing against the tire, or even the tire going bad itself.
To check the wheel bearing, jack up the car (Make sure to engage the emergency brake and place bricks behind the back tires), and try to wiggle the wheel from side to side, and up and down by putting one hand on the top, and the other on the bottom.
If there's any play in the wheel, then yes, it's the bearing.
Driving on a bad wheel bearing is extremely dangerous. I have seen entire wheels pop off of cars while they were going down the highway. Once a wheel bearing begins to go bad, you never know when it'll fail completely.
You should take that car in to a shop immediately.
Monday, January 4th, 2010 AT 6:42 PM