I also have the hood rattle that RS250R references in his post. I have tracked it down to the latching mechanism. When the hood is shut, there is still play in the hood when you push down on it. It is as if the latch is too far up. I adjusted the hood "bumpers" on each side of the hood hoping that would hold the hood tight up against the latch, but the "bumpers" don't seem long enough to make a difference. If anyone knows anything about this hood rattle please post. As far as the fan rattle, I have no rattle but the fan is noticeable with the windows down or when outside the truck. I don't think it's a problem; more air--cooler engine, and with an all aluminum engine, that's something we need!! Thanks.