the 2010 vibe just has crank, then A/c on the bottom, water pump in the middle and alt on top, it doesn't have a tensioner. needless to say I just found out the hard way it was water pump, as it seized up on me, thanks to info tho and the quick response with trying to help.

ok after looking at the link you posted.. I am thinking it isn't the A/C.. it is the middle pully.. below the alt. would that just be an idler pully, and if so is it possible to tighten it?

On Thanksgiving my 2010 vice started making a weird rattle, when driving, parked and when starting. replaced the serpentine belt yesterday and noticed the idler pully on the A/C is loose and wobbly. does anyone know if there is a way to tighten this or do you need to replace the whole compressor? if...