Gfs 2006 Chevy Malibu had an old serpentine belt so I changed it out and it worked great for a day or so then started squealing again. It used to do it only under load with the AC on and such now it squeals for a second when started then finally will go away.
https://preview.redd.it/amvl6mv14f1c1.jpeg?width=3024&format=pjpg&auto=webp&s=14f667a2a8a2098322634fa06ff3ecd016457edd