with a 9/16 socket and ratchet
There is no tension adjustment. Tension is automatically adjusted by the idler pulley.
replace tension put it on
Put the proper size wrench or socket on the pulley of the tensioner.Pull the wrench counter clockwise to release the tension on the belt.
Use a socket and ratchet on the bolt that holds the 95 Park Ave serpentine pulley. Pull the ratchet to the side and the pulley will swivel, loosening tension on the belt. Remove the belt, install the new belt in the same manner.
Serepentine bels do not have tension adjustments, there is a tension pully That is preloaded with a coil spring in it. If the belt is loose, the pully spring may have lost it tension. Replace the pully assembley.
I have used a socket with a ratchet handle. The ratchet will allow you to get more travel to move the pulley and get the belt off.
put a wrench on the tensioner pully and pull it to release tension on the belt
Old age Frozen or misaligned pulley
Put a socket and ratchet on the tensioner belt pulley. Pull to the side, releasing the belt tension. Remove the belt and put the new one on, a helper will make this easier. Take the ratchet off to re-tension the belt.
pull the tensioner to relieve the tension and slip the belt over the alternator pulley. The tensioner is a spring-loaded pulley below the alternator. The tensioner takes a special tool that fits into a square hole in the side of it. Or you can use an 18 mm socket on the tensioner's pulley bolt. Follow the decal near the right front corner of the engine compartment to route the new belt.
Use a socket and ratchet on the belt tensioner pulley bolt. Pull the ratchet to the side to let tension from the belt. Remove the belt. Install the new belt ( a helper will make the job easier.) Release the ratchet to set the belt tension.
Best to get a shop manual for this operation, if you have not replaced it before. Usually there is an "Idler Pulley" on many late model cars that is "spring loaded". You "Bias" this pulley using the big nut in the middle of the pulley (usually with a socket wrench) so that the serpentine belt has enough slack in it so you can remove it. Install new belt by reverse procedure. TommyTrouble