[RobertHammen]

For a quick visual inspection of the serpentine belt, shine a flashlight on a place where the "underside" (i.e. ribbed, non-smooth side) of the belt is visible. If there are multiple cracks in the rubber there, it's definitely time to replace it. Just did this a few weeks ago, ended up taking off the passenger front tire and pulling the shielding off to more easily route the new belt. She runs quieter now (except for the roar when I put my foot into her, after modding my airbox :-)

--Robert