ok so i have an 01 suburban, 1500 2wheel drive, 5.3. i have this damn squeak in my belts i can't get rid of. so far i have: 1. changed both belts, 2. changed both tensioners, the alternator and it still freaking squeaks!! i changed the alternator today because with the belt off and spinning by hand i heard a slight squeak. then it still made the noise so went and bought the main tensioner. it went away for like 5 mins then came right back!! its so damn annoying!! seems to be very slight at idle and then when i take off it gets really bad. seems to happen more when its cold. but lately even after 1 hour of driving i can still hear it. what else can i do?? i want to get some belt conditioner and try that but it seems like a cover up??