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Automatic Button: When the “AUTO” button is pressed, the control
module operates all the air discharge flap motors according to Y-factor.
If cooling is needed, the face vent outlet flaps are fully opened, while
the windshield defroster and footwell flaps are fully closed. If heating
is called for, the face vent outlet flaps are closed, and the footwell and
windshield defroster flaps are fully opened. For some mid-range Yfactor
values (e.g. 40%) all air distribution flaps are partially open.