Honda 1994 Prelude Online Reference Owner's Manual page 77

Heating and Cooling
To Defog and Defrost
To remove fog from the inside of
the windows:
1. Switch the fan on.
2. Turn on the air conditioning.
3. Select the Fresh Air mode and
4. Adjust the temperature control
lever so the air flow from the
defroster vents feels warm.
5. Turn on the rear window
defogger to help clear the rear
window.
To remove exterior frost or ice
from the windshield and side
windows after the car has been
sitting out in cold weather:
1. Start the engine.
2. Select the Fresh Air mode and
3. Switch the fan and temperature
controls to maximum.
Comfort and Convenience Features
To rapidly remove exterior frost or
ice from the windshield (on very
cold days), first select the Recircu-
lation mode. Once the windshield is
clear, select the Fresh Air mode to
avoid fogging the windows.
These settings direct all the air
flow to the defroster vents at the
base of the windshield and the side
windows. The air flow will get
warmer and clear the windows
faster as the engine warms up. You
can close the corner vents with the
dial beside each vent. This will
send more warm air to the wind-
shield defroster vents.
For safety, make sure you have a
clear view through all the windows
before driving away.
To Turn Everything Off
To shut off the system temporarily,
slide the fan speed and temperature
control levers all the way to the left.
You should shut the system com-
pletely off only for the first few
minutes of driving in cold weather,
until the engine coolant warms up
enough to operate the heater. Keep
the fan on at all other times so stale
air does not build up in the interior.