Ive had my truck for over a year now and a little bit ago ive started to hear a winding noise on acceleration. so i thought it was the alternator tourned out tonight it wasnt. my buddy is a mehanic and thinks its the ac pump on the belt system. theres a bypass i could order and get for 40 bucks and i was just wondering if it would be worth it? orr does anybody have any suggestions?

thanks alot