My serpentine belt had some noise. I had the tensioner and idler pulley replaced (couldn't figure out which was making the sound) and had the belt replaced. About $50 parts and $50 labor.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15