Ford Mercury Villager 1997 Owner's Manual page 64

To defrost the windshield and side windows:
Press the Defrost button, turn the temperature control knob to
the WARM (red) area and turn the fan speed knob to the
position of your choice. The recirculated air feature will be
automatically turned off in this setting (outside air will be
provided).
To reduce window fogging under extreme conditions, select
defrost and high fan speed while reducing temperature to a
"warm" instead of "hot" setting. Deactivating the air intake
selector may also help dry the interior window surfaces.
To heat and defrost at the same time:
Press the Mix function selector button, turn the temperature
control knob and the fan speed knob to provide the
temperature and fan speed you prefer. The recirculated air
feature will be automatically turned off in this setting (outside
air will be provided).
Controlling the Temperature in Your Vehicle
To ventilate your vehicle with outside air, make sure that the
air intake selector button is set for outside air. Open the
instrument panel registers enough to provide the amount of
air desired for your comfort.
To vary the temperature inside your vehicle, move the
temperature control knob toward WARM (red) for warmer
temperatures and toward COOL (blue) for cooler temperatures.
The temperature control knob setting determines the
temperature of the air being discharged from the system in all
operating modes (heating or A/C).
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