Porsche 928 ST1991 Owner's Manual page 52

Important notes:
• The air conditioner operates only with
the engine running.
• When the air conditioner is switched
on, at least one air outlet vent must be
opened, since otherwise the vaporizer
can ice up. The condensate forming
during operation of the air conditioner
escapes through openings at the bot-
tom of the vehicle.
• The air conditioner must be switched
on briefly at least once a month to lub-
ricate the seals and bearings of the air
conditioner compressor and the ex-
pansion valve. This is particularly im-
portant in the winter when the air con-
ditioner is not needed. The outdoor
temperature must be above 32° F/0° C.
• Whenever the air conditioner does not
function properly, e. g. no cold air es-
capes even though the unit is switched
on, switch it off and immediately see
your Porsche dealer.
The following controls make possible op-
timum adjustment of the unit to your indi-
vidual air conditioning desires.
Temperature control - upper lever
The lever provides continuous control for the
temperature in the passenger compartment.
Shoving it to the right raises the tempera-
ture. The value on the temperature scale cor-
responds to an average inside temperature.
No automatic temperature control takes
place in program settings
Fan speed control - rotary switch knob
The air volume is controlled by a 4-speed
fan. When the ignition is turned on, the fan
automatically operates at low speed, even
with the switch in 0 position. By turning the
knob clockwise, fan speeds 1 - 4 can be
selected to increase the air volume.
Program control - lower lever
There are several programs available in
order to adapt to individual needs with an au-
tomatically controlled air conditioner:
Supply of outside air switched off. For
brief operation, e.g. when passing
through disagreeable odors.
Air flow distribution only through side
window and center air vents.
Air flow distribution through footwell
outlets. The side and center vents can
be opened optionally.
Air flow distribution through wind-
shield and footwell outlets. The side
and center vents can be opened op-
tionally.
Air flow distribution through wind-
shield outlets. The side and center
vents can be opened optionally.
Automatic air flow distribution for
heated air through windshield outlets
and open side window vents. Heating
system and fan motor are automati-
cally switched on maximum output
and high speed for fast defrosting or
defogging. At temperatures above 32°
F/0° C the air conditioner compressor
switches on automatically.
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