OK, just recently my truck has a different humming sound when it is in idle. I only noticed it because i forgot something in the house and had to go back in and as i was walking in front of it i heard it. Well i popped the hood and tryed to listen for it and it sounds like its coming from the belts. Maybe its the fan i dont know. Anyone have ANY ideas THANK YOU


p.s. i do not hear this sound when i am inside the truck.