I have a 2002 ML500. It is making a really funny noise inside the vents. It is a really hard noise to explain. It kind of sounds like a thick rubberband being stretched back and forth. It even does it when the car is first turned off. It has been doing it for about a month now and is quite loud. If there is anyone who has heard of this or thinks they know what it might be, I would greatly appreciate your help!