Porsche 928S 1983 Driver Manual page 40

An airstream is also
directed toward the windshield.
Automatic temperature
Heating and cooling (during normal
weather conditions). Air is distri-
buted according to a predetermined
programme to suit the outlet tem-
perature. The center vent may be
closed manually.
Same as position AUTO in addition
the defrost vents are opened. This
position is recommended during
wet and humid weather (rain, heavy
snowfall) to prevent the windscreen
from fogging up. It also provides
better cooling at head level and in
the footwells when outside air tem-
peratures are very high.
Defrost position: provides fastest
possible defrosting of the iced or
fogged up front screen and side
windows. With this programme the
38
maximum heating effect and high-
est blower fan speed are switched
on automatically and the full air flow
is directed to the windscreen and
the side vents. The center vent is
control.
closed automatically.
To prevent uncomfortable draughts, in posi-
tions
matic control first comes into operation at cool-
ant temperatures above approx. 45° C. Below
these temperatures the uncooled fresh air is
prevented from entering the footwell by a cold
start shut off device.
Blower fan switch
To provide air circulation when the vehicle is
standing still or at low speeds the blowerfan
runs at low speed even when the switch is in
the 0 position. Should you require increased
air flow the blower fan can be switched from
positions 1 to 4.
the auto-