So I'm getting a weird noise. It's sort of rattling/rumbling noise that seems to get faster and slower with engine revs. It was pretty bad this morning so I popped the hood and it sounds like it might be coming from the mechanical fan. Question one, should I be able to turn the blades by hand while the serpentine belt is installed? Question two, the belt needs to be replaced, could this be causing a noise as well?
S
S