He did say passengers side. So it's something to do with the serpentine belt.
Flash a light down there and see if it all looks lined up. Could be something stuck, could be a lax tensioner.
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2008 Mercury Sable Premier
2014 Ford Focus Electric
1997 Mercury Grand Marquis GS
1991 BMW 850i E31 M70 V12
Moved On: 2000 Sable LS Premium Duratec