Ford Mercury Villager 1997 Owner's Manual page 74

When in AUTOMATIC and weather conditions require heat, air
is sent to the floor. However, a feature is included in the ATC to
prevent blowing cold air to the floor if the engine coolant is
not warm enough to provide heating. Within three or four minutes
(once the engine coolant is warm enough), the fan speed
gradually increases and airflow changes to the floor.
If specific conditions exist (such as window fogging), the five
override buttons allow specific airflow selection. The dial allows
you to adjust the fan speed to suit your needs.
Temperature Selection
The TEMP button on the left side of the control panel is
for temperature selection. The side lowers the set temperature,
and the side raises the set temperature. Press and hold
either side of the button to rapidly change the temperature setting
in one degree increments to either 65° F (18° C) or 85° F (29° C).
Then, the set temperature jumps 5° F and stops at either 60° F
(16° C), which is maximum cooling, or 90° F (32° C), which is
maximum heating.
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