The past couple of days I have been hearing a weird noise coming from my truck. It's kinda of hard to explain but is coming from either the pulley's or the supercharger. It is a constant whine on idle and increases when I drive the truck. It sounds like the supercharger does when it is in boost, but this sound is on idle and driving. It just started doing this since the weather got cold here in Oklahoma. When I am under boost the supercharger sounds like it always did, but when not under boost you can still hear the whining sound. Sometimes it is pretty loud and sometimes you can't hear it at all. I know the description is kinda vague but any ideas will help. Thanks guys!!