so i finally got a chance to work on the truck. pulled the fan belt off and the noise stopped. spun the water pump pulley and it made some grinding noises. i'm trying to get the fan off of the pulley and not having much luck. I'm about to pull the front end of the truck apart to get to it. any advice? i'm not adverse to pulling the front end off.......Idler pulley, idler control arm, alternator bearings, fan clutch, a/c compressor, hard to really tell not having the truck in front of me, but it sounds like a bearing somewhere.
An easy way to pinpoint this may be to temporarily remove the fan belt and see if the noise goes away. If so you know its in one of the belt driven accessories.