Ford Mercury Villager 1997 Owner's Manual page 63

Turning on the heat
Heat will be available when the engine has been running for a
sufficient time as indicated by the engine coolant temperature
gauge.
To heat the inside of your vehicle:
1. Press the function selector button for Floor.
Heating only climate control system panel
2. Turn the temperature control knob toward the WARM (red) area.
3. Turn the fan speed knob to the speed of your choice. When
your vehicle warms up, you may want to set the fan speed
knob to a lower speed, or adjust the temperature control knob
to a lower setting to maintain a comfortable temperature.
Controls and Features
59