Do you know how the flap is attached to the rod? It seems to me that it has just fallen off. The stepper motor on the passenger side actuates both flaps I am assuming? I pulled the motor on the floor vent passenger side and opened the floor vent by hand. This allowed me access to the actuator for the center flaps. When I moved the arm only the center flap on the drivers side moved up and down. The center flap on the passenger side isn't attached to a motor on the drivers side is it?