It could just be the belt tensioner pulley or the idler wheel pulley above it which are in the location you describe. Mine were noisy on my V6 Mystique. You could buy a mechanics stethescope to listen to the idler bearings at Sears. Possibly the alternator could be noisy. (Make sure your waterpump has been changed, to a metal impeller pump, a common failure, but not your noise)
