The serpentine belt tensioner can fail; it may become noisy and/or the belt may jump off. Replacement of the failed tensioner will be necessary.Google+
Car Problem Reports
Chevrolet S10 Serpentine Belt Tensioner May Fail
Chevrolet S10 Problem
Engines Affected: 2.2L 4 Cylinder, 4.3L V6
Average Mileage: 114,834 mi (67,000 mi - 170,000 mi)
Visitor, 2002 Chevrolet S10, 2.2L 4 Cylinder, 92,000 mi
tensioure pulley broke. took to shop for repair.
had to replace this twice on a 1996 Chevy Blazer with the 4.3 engine within 5 years and about 30K miles.
Visitor, 1999 Chevrolet S10, 2.2L 4 Cylinder, 120,000 mi
it started sqeaking Then the belt jumped off and the entire tensioner departed
Visitor, 1996 Chevrolet S10, 4.3L V6, 96,678 mi
Idler bearing making loud squeeking noise. I will need to replace it as well as serpentine belt.