Thanks guys. I haven't tried to move the fan or pulley to see if either move. I was looking at the idler pulley the other night when the truck was running and it seemed to have some movement in it that I hadn't noticed before. Got to wondering if that was the noise I'm hearing.

I've seen where coolant has been splashed up onto the HPOP resevior so if it's coming from the weephole, is there a way it can get flung up there?