Honda 1990 Civic Hatchback, Owner'S Manual, Page: 57 / 131

Heating and Cooling (cont'd)
To Heat
Switch the fan on, turn the temperature control dial clockwise, slide
the function lever to the position and the recirculation lever
to the position, and warmed (outside) air will begin flowing
from the floor outlets.
To warm up the interior quickly, slide the recirculation lever to the
position so inside air will recirculate to the heater.
The windows may become fogged if the system is in the
position for an extended period of time. As soon as the
interior is warmed, slide the lever to the position.
To Dehumidify (with optional air conditioner)
Because an air conditioner dehumidifies as it works, you can use it
in cool or cold weather to help defog the windows. Just switch the
fan on, push the A/C button on, select the desired function and
adjust the temperature control dial to a comfortable setting.
NOTE:
This setting is desirable for most operating conditions in ambient
temperatures above approximately 32°F (0°C).
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