While we are on this subject, My SEL has a vent between the seats for rear airconditioning. I nomally only use the car in summer but had a chance to use it when it was cold out. I get excellent heat in the car, but the air coming out of the center vent to the backseat blew ice cold air on the ladies in the back seat. Turning the vent off corrected the problem. Is this normal?. Is this vent not designed to blow hot air?