Porsche 911 TURBO - 1975 WORSHOP, Manual

Page: 123 / 252

Controls, Safety, Instruments
123
f Press button B (switch on or off).
The windscreen is demisted or defrosted as
quickly as possible.
Air flows to the windscreen only.
The light-emitting diode in the button lights up.
AC OFF – switching the air-conditioning
compressor on and off
At temperatures below approx. 3 °C (37 °F), the
air conditioning compressor switches off automat-
ically and cannot be switched on, even manually.
Whenever outside temperatures exceed approx.
3 °C (37 °F), the air-conditioning compressor is
always switched on in automatic mode.
The compressor can be switched off to save fuel,
but control comfort is then limited:
f
Press AC OFF button
E
.
The compressor is switched off.
The light-emitting diode in the button lights up.
f If the interior temperature is too high, switch
compressor back on or press AUTO button.
To dry incoming air in damp weather, do not
switch off the air-conditioning compressor.
This prevents misting of windows.
f Press button M upwards or downwards
respectively.
The preset blower speed is increased or
decreased.
The speed stages are indicated by a bar display.
If the button is pressed downwards at the lowest
blower stage, the blower and automatic control
are switched off. “OFF” will appear on the display
field.
Pressing the button upwards or pressing the
AUTO button switches the blower and automatic
control back on again.
The outside-air supply is interrupted and only the
inside air is circulated.
Warning!
Risk of accident due to hampered vision.
In circulating-air mode, the windows may
mist up.
f Only select circulating-air mode for short
periods.
f If the windows mist up, switch circulating-air
mode off immediately by pressing the circu-
lating-air button again and select the “Defrost
windscreen” function.
Switching circulating-air mode on or off
f Press button C .
The light-emitting diode in the button lights up.
Above approx. 3 °C (37 °F)
If the air-conditioning compressor was off, it
switches on automatically. The duration of circu-
lating-air mode is not limited.
Below approx. 3°C (37 °F)
The air-conditioning compressor is switched off.
Circulating-air mode is automatically ended after
approx. 3 minutes.
Defrosting the windscreen
Adjusting blower speed
Circulating-air mode