Take a look at the pulleys that the belt touches and see if one of them is not "true."
serpentine belt for 97 7.4 454 Chevy truck
need diagram for 1994 chevy truck serpentine belt?
replacing serpentine ford f650
When a serpentine belt is loose it means either the belt has stretched and needs replacing, or the idler tensioner is defective and needs replacing, or both.
Not if you have a serpentine drive belt............
replacing serpentine belt on 2000 chevy prizm need help
if a serpentine belt is loose, it needs replacing. there is an automatic tension pulley on all serpentine belts. so just buy a new belt and install
The total cost for replacing bolt, serpentine belt and belt tensioner on a 2006 Honda Civic?
You don't tighten a serpentine belt. The tension is controlled by a tensioner. If it is loose, then the belt has stretched and needs replacing.
How to remove and install the serpentine belt on 1991 Chevy Blazer with AC?
Serpentine belt has stretched and needs replacing or the tensioner is defective or both.
More than likely the tensioner is defective and needs replacing.