Really??! That's a new one for sure! And I'm not sure I like it. Are you saying you can't shut off one air vent, like the one on the far right (passenger) side of the dash if you have no passenger, in order to direct more air to the driver? If you do it, all the vents will close? that's bizarre. or maybe I'm not understanding you. (i'm surprised those vent louvres have a small motor on them). will have to check it out tomorrow.Discovered something new in the S. All the vents including the ones in the back will close if you move the horizontal slider to one extreme. Probably a feature inherited from mercs but nevertheless pretty cool.