Honda 1997 Prelude Owner's Manual page 78

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
When you select
system automatically switches to
Fresh Air mode and turns on the
A/C.
3. Switch the fan and temperature
controls to maximum.
To rapidly remove exterior frost or
ice from the windshield (on very cold
days), first select the Recirculation
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 window
defroster vents. The air flow will get
warmer and clear the windows faster
as the engine warms up. You can
close the side vents with the dial
underneath each vent. This will send
the
more warm air to the windshield
defroster vents.
For safety, make sure you have a
clear view through all the windows
before driving away.
Heating and Cooling
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
completely 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.
Comfort and Convenience Features