Lincoln 1997 Town Car Owner's Manual page 64

To change the temperature display to ˚F or ˚C,
press and hold the MAX A/C and DEF Buttons at
the same time for 3/4 second. The display will
change. If you continue to press the two buttons,
the display will continuously switch between ˚F and
˚C. If the temperature display does not agree with
the speedometer on vehicles with an E/M button,
pressing the E/M button will make them agree.
Fan speed and thumbwheel
Your EATC automatically adjusts the fan speed to
the existing conditions. You must push
AUTOMATIC for automatic fan speed operation. To
control the fan speed yourself, use the thumbwheel
which will cancel the automatic fan speed control.
The thumbwheel is located at the extreme right
side of the EATC control panel. It is a vertical
control marked with a fan symbol. Rotate up for HI
and down for LO speeds.
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