About a month ago, I started hearng a strange noise from the passenger saide of the car when idleing or under low rpms (2000). I have had the belts checked, tranny and a few pullys. the car has 110k and some say it might be the water pump bearings but they would make noise under the entire rpm range, other say it may have something to do with the timing - should I just change both and see - need some help.