i think its coming from the belt, when i accelerate between 10 and 30 mph i hear a rattling noise coming from the front of the engine i believe, but one at 35 it goes away, i think my belt might need changed im not sure, i know its one of those pulleys up front and i think its the one that serves no purpose as far generating goes, but idk, iv got my codes scanned and the alternators good and so is every other electrical and engine componet know lights are on, besides my brake light but thats cuz i hit the e break. iv tried wd 40 cuz recently my pulley that turns the fan is squeakin, but this is not a squeak its a mild rattle, that i can hear with blower and stero off, but i love my truck and baby it so this is an issue im addresing please give me some feedback thank you.