There should be a small square hole near the tensioner pully. A 3/8 socket driver will fit in the hole and then you can losen the tensioner.
Loosen the tensioner pulley on your 2001 Chevy Impala. The serpentine belt will become loose. Take the old belt off and put the new belt on. Tighten the new serpentine belt with the tensioner pulley.
there should be a tensioner pully. Put the 3/8 ratchet in the center of it and turn.
Use penetrating oil and correct size wrench.
If it is a serpentine belt you replace the tensioner pulley
Remove serpentine belt. Remove alternator. The bolts that hold the tensioner on are under the alternator.
if it is a belt squeal, check and replace the serpentine belt and or the tensioner.
There is no adjustment on the spring / Tensioner. You either have the wrong belt are the tensioner itself is bad. Replace tensioner are belt.
use a breaker bar to release pressure on automatic belt tensioner
Push the tensioner down and remove belt
Put a wrench on the tensioner. Push it slack. Replace the belt while holding the tensioner in the slack position.
Typically, there is one pulley that is mounted on a spring arm to maintain proper belt tension. Just turn the bolt on the idler pulley and the tensioner will release.
Replace serpentine belt on Chevy avalanche?HOW