There is no way to adjust the belt tensioner, if it's not keeping enough tension on the belt the complete tensioner itself will need replaced.
How do I rethread the serpentine belt on a 2002 Malibu with a V-6?
no!
very carefully
it is preset at manufacturing !!
frozen pulley
It has a serpentine belt and has a self adjusting tensioner.
There is no adjustment.
no adjustment!! set at factory.
usually serpentine belts get their tension(tightness) from the belt tensioner
how to release serpentine belt tensioner on 1991 C1500 Chevy Silverado?
where is the location of tensioner of 2002 3.1 L Chevy Malibu to adjust if replacing the alternator?
you dont adjust a tension pulley you adjust the position of the compressor to tighten the belt