Honda 1996 Civic Sedan Online Reference Owner's Manual page 69

Mode Buttons
These buttons let you select which
vents the air flows from.
Air flows from the center
and corner vents in the dashboard.
Air flow is divided between
the vents in the dashboard and the
floor vents.
Air flows from the floor
vents.
Air flow is divided between
the floor vents and the defroster
vents at the base of the windshield.
Air flows from the defroster
vents at the base of the windshield.
The A/C switches on and Fresh Air
mode is selected automatically when
you select
Heating and Cooling
Comfort and Convenience Features