Lincoln 1997 Town Car Owner's Manual page 70

Rear Window Defroster and
Heated Sideview Mirrors
The rear window and heated outside mirrors
defroster switch activates the defroster for the rear
window to clear frost, fog, or thin ice from both
the inside and outside of the rear window and
activates the heated outside rearview mirrors.
The switch for the rear window defroster and
heated outside rearview mirrors is located to the left
of the climate control.
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The switch that controls the rear window
defroster and heated outside rearview mirrors
Before using the defroster, clear away any snow
that is on the rear window and outside rearview
mirrors. With the engine running, push the
defroster button.