To Defrost; To Turn Everything Off - Honda 1990 Civic Sedan Owner's Manual

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To Defrost

To defrost or defog the windshield and door windows, turn the
temperature control dial clockwise, slide the function lever to the
(defrost) position, the recirculation lever to the
position, and switch the fan on. Warmed (outside) air will
then flow from the windshield and side defroster vents. Use the
position only.

To Turn Everything OFF

Slide all levers to the left, turn the temperature control dial
counterclockwise all the way, and push the A/C switch off.
NOTE:
This setting should only be used in cold weather for the first few
minutes of driving to prevent cold air from blowing into the cabin.
Under normal operating conditions, the fan should always be kept
ON to prevent the accumulation of stale air in the system.