Air Conditioning - Porsche 928 1980 Owner's Manual

Air conditioning

The air conditioner works only when the
engine is running. The higher the engine
rpm, the more intensive the cooling effect.
Air temperature is kept constant by a ther-
mostatic sensor located between the cooling
fins of the evaporator. Air from inside the car
is drawn through the evaporator for cooling
and then reenters the car interior through
the air outlets.
On vehicles equipped with an automatic
climate control system, the air conditioner
compressor is activated automatically when
the lower lever is moved to the AUTO or Bl
position. On vehicles equipped with a stan-
dard air conditioning system, the compres-
sor is activated by depressing the A/C
switch. With an activated compressor, the
engine runs at increased idle speed. At an
engine speed of about 5500 revolutions per
minute, the compressor will shut off auto-
matically.
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Operating hints
To obtain maximum cooling, move upper
lever to the extreme left, open side window
and center air vents, and turn the fan control
knob to speed 4. Cool air will also flow from
air nozzle inside the glove compartment.
If the car has been standing in the hot sun
for a long time, it is best to open the windows
first to permit hot air to escape. After the
windows have been closed and the desired
temperature attained, reduce cooling output
and fan speed.
During periods of high humidity and low
temperatures, the air conditioner can be
switched on together with the heating sys-
tem. Move upper lever to the right for de-
sired heating output and turn the fan control
knob to speed 2 or 3. These adjustments will
provide a pleasant mixture of cool/warm air
circulation. The air in the car will be de-
humidified and fogged up windows will clear
up.
The air conditioner should be switched on
briefly at least twice a month. Periodic
operation of the air conditioner is necessary
to lubricate the crankshaft seals and the
expansion valve. This is especially important
during the cold season when the air condi-
tioner is not used.
Caution: Should uncooled air flow from
the air outlets, switch the system off.
Further operation could lead to compres-
sor damage. Have your Porsche dealer
locate and correct the problem. He has
qualified personnel and the necessary
equipment.
Maintenance
The condenser should be checked period-
ically for cleanliness. If clogged with dirt or
insects, the condenser should be washed
down with water. After the winter months
before extended summer usage, the air
conditioner should be checked and, if ne-
cessary, serviced.
Payload reduction
The weight of the air conditioner installation
reduces the vehicle's capacity weight. For
weight information see sticker on left door
sill.