k guys for those who dont want to pay the $400. for the dealer to replace your belt tensioner that "will" come apart if it hasent already out of warrantee, its actually easy if you dont follow the sevice book
from the top of the engine get a 3' bar and push down on the tensioner, then put the pin in to lock it (i made one out of a welding rod) then unbolt it and pull through the bottom of the fan shroud.
bolt the new one on, push down on tensioner again and pull pin thats it your done

A special thanks to Sr Master Tech Rusty for the tips