Ford 1997 Contour Manual page 50

Controls and Features
FLR/DEF
Select FLR/DEF to get air to the floor and windshield defrosters
at the same time.
V DEF
Select V DEF to obtain maximum air flow to the windshield.
Rotate the temperature control into the RED area for the air
temperature required to defrost. Rotate the H control to
increase the air flow.
Heating and Air Conditioning System
Heating, ventilation, defrosting and defogging are accomplished
in the same way as with the heating only system. See "Heating
Only System."
With the heating and air conditioning system, if the outside
temperature is about 50˚F (10˚C) or warmer, the air will be
dehumidified to remove moisture if you select FLR/DEF or V
DEF.
The control for the heating and air conditioning system
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