My fan has always made a pretty loud humming/roaring noise when I first take off in the morning seems like its louder in the cold weather. Never had a problem with it though and the truck is 13 years old. You could have the dealer remove the serpentine belt and rev the engine, see if that eliminates the noise. If so then its either the fan or one of the other FEAD components.
Last edited by DYNOTECH; 02-06-2010 at 06:04 PM.