............is there a way to get the center vent for the back seat passengers to blow warm air(heat)? When I am driving long distance with passengers in the back seat, they are always complaining that they are getting cold back there. I known that's a issue on long runs because as a driver you don't need all that heat, but as a passenger it's the opposite. Because of this issue, and there is a vent for the back, that's why I'm asking this question.

How can I do this so that everyone is comfortable?

Thanks in advance for sharing you comments/helping advice.