Ford Mercury Villager 1997 Owner's Manual page 76

Press this button to obtain maximum airflow to the windshield.
Adjust the temperature setting as required for defrosting. The
indicator light illuminates and the display window shows
the set temperature. When the outside temperature is about 50° F
(10° C) the air conditioning functions in order to dehumidify
the air to prevent window fogging.
Push this button to select airflow through the instrument panel
registers. The indicator light illuminates and the display
window shows the set temperature. The ATC heats the air if the
selected temperature is warmer than the outside air coming
into the vehicle. However, the air is not cooled below the
temperature outside of the vehicle regardless of the temperature
setting unless the A/C button is pushed.
Push this button for air from the floor and instrument panel
registers at the same time. The indicator light illuminates and
the display window shows the set temperature. The ATC heats
the air if the selected temperature is warmer than the outside air
coming into the vehicle. However, the air is not cooled below
the temperature outside of the vehicle regardless of the temperature
setting unless the A/C button is pushed.
Push this button to direct airflow to the floor. The indicator light
illuminates and the display window shows the set temperature.
The ATC heats the air if the selected temperature is warmer than the
outside air coming into the vehicle. However, the air is not cooled
below the temperature outside of the vehicle regardless of the
temperature setting unless the A/C button is pushed.
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