Wondering if this is normal or if I have something going on with a blend door or something. I've noticed if I don't have my AC on the car has hot air passively blowing in from the floor vents. I know on newer model cars, air comes through the vents unless the recirculate button is pressed, but I'm pretty sure we don't have that option. Any help with this is appreciated because it makes for a pretty uncomfortable ride after a while.