BMW 840Ci Owner's Handbook Manual page 80

Automatic air conditioning
b
If the windscreen mists over on
the outside when atmospheric humid-
ity is very high, press the AUTO button
or the airflow button for the footwell
outlets only. No cooled air will then be
directed onto the windscreen.c
a
Press this button to increase the
airflow out of the ventilation grilles if
the windscreen and side windows
mist over during a journey and it
would be undesirable to press button
6 (maximum windscreen and side
window demisting).c
Airflow to the footwell outlets
only
The demisting outlets are also
slightly opened.
This program is recommended in cool
weather, for example, when airflow
from the grilles is not wanted, or to
heat up the footwells rapidly.
b
In all programs, air emerges
from the demisting outlets only at first
after a cold engine has been started,
until the heater matrix has reached
app. 306.c
Pushbutton for maximum
demisting and drying of wind-
screen and side windows
The windscreen and the side
windows can be cleared and
dried rapidly with this pro-
gram. The previously selected pro-
gram is not lost.
For maximum effect, the engine must
be at regular operating temperature.
Pressing this button again (the LED
goes out) automatically restores the
system's previous settings.
The windows mist or fog over as a
result of moisture and condensate
caused severe differences in tempera-
ture or a high level of humidity. The
only remedy is to dry the glass with
plenty of warm air.
b
The first time this button is
pressed after starting the engine, the
rear window heating is also switched
on.c
Air conditioning
The air is cooled and dried
when the air conditioning is
switched on, then re-heated
according to the chosen temperature.
Depending on weather conditions, the
windscreen may fog over momentarily
when the engine is started.
At outside temperatures below about
56, switch the air conditioning off to
prevent the windows from fogging.
The windows may mist over if the sys-
tem is switched on and off too often.
If air humidity is very high, it is best to
switch the air conditioning on in good
time (before moisture condensate
can reach the evaporator) and dry the
air, so that the windows do not fog
over. Take care not to direct cooled air
on to the windscreen, as it could mist
or freeze over on the outside.
At the maximum cooling setting, the
system switches over automatically to
recirculated-air operation and the
defroster outlets are closed.
We recommend leaving the air condi-
tioning system switched on perma-
nently in the summer.
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