Ford Mercury Villager 1997 Owner's Manual page 62

There are several air outlets on the instrument panel. There are
side outlets near the driver's window and passenger's window, two
center outlets, floor outlets, and windshield outlets. The
direction and amount of air flow from the center and side
instrument panel outlets can be adjusted for personal comfort.
NOTE: Selection of the recirculated air mode under cold and
humid conditions may result in window fogging due to
entrapped humidity within the vehicle. To counteract
this circumstance, switch to the Defrost mode and set fan
speed to 3 or 4. Adjust air temperature to a "warm"
instead of "hot" setting and deactivate the air intake
selector.
Heating Only System (Without air conditioning)
You can heat and ventilate the inside of your vehicle, or defrost
the windshield with the function selector buttons, the fan speed
knob and the temperature control knob.
An additional push-on/push-off air intake selector button
provides for the selection of recirculated inside air (button lighted)
or outside air (button not lighted).
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