Porsche 928S 1983 Driver Manual page 39

The automatic controls the temperature in-
side the car according to the programme
chosen and the temperature control lever
position.
The interior temperature is kept constant
even under changing climatic conditions.
Cold and warm air is blended automatically
by means of air mixer valves which are ope-
rated by a servo motor. The servo motor is
switched and controlled via inside and out-
side temperature sensors as well as the
coolant thermometer.
The following controls make an individual re-
gulation of the air conditioning possible:
Temperature control lever for adjusting the
required interior temperature with tempera-
ture scale. The adjusted temperature is
equal to the temperature in the middle of
the vehicle interior.
As heat output is dependent on the coolant
temperature, the full heating capacity is deli-
vered only after the engine has reached nor-
mal operating temperature.
Programme control lever to enable the au-
tomatic air conditioner to meet individual re-
quirements several programmes are avail-
able.
Air conditioner and blower fan
switched off.
Automatic heater control. No cool-
ing is possible on this position be-
cause compressor is switched off
for fuel ECOnomy. This program-
me is recommended when out-
side air temperatures are below
+ 5 ° C (40° F).
37