Porsche 928 S4 – Owner’s Manual |
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Model Year 1987 From
the “Porsche 928 S4 Owner’s Manual”, available from 928 Specialists. |
Air outlets for
windshield and footwell The
air outlets for the windshield and the footwell are fixed in place. Only the fan switch is used to
regulate the air flow. Center and side nozzles The
air flow from the center and side nozzles can be varied by pivoting the
nozzle inserts and by adjusting the vents. A
lever attached at the side of the nozzle provides continuous control for the
air flow to the side and center nozzles. This
system automatically controls the air flow distribution and the temperature
level inside the car according to the occupants wishes. The distribution and mixture of cool
and warm air is electrically regulated and kept constant, regardless of
weather conditions. The
heater works
only when the engine is running.
Maximum heating output and fast defrosting can be obtained only
after the engine has reached operating temperature. Servomotor-controlled
air mixture valves automatically mix the cold and warm air. The
temperature inside the vehicle (temperature sensor behind the screen mask) and
outside the vehicle (temperature sensor in the wheel box) are used for quick
identification of temperature fluctuations and control of the servomotor. “AC” pressure switch
When
the weather is warm, supplying of fresh air is not always enough to attain
the desired temperature within the car. First
set the temperature desired using the temperature lever. Then switch on the air conditioner by
pressing the AC switch in the center console. If
no cooling of the air is required in transitional or colder seasons, the air
conditioner should not be switched on due to considerations of fuel economy. With
sudden fluctuations in temperature, the automatic system regulates the
control of warm air, fresh air, and, if the air conditioner compressor has
been switched on, the supply of cooling air until the preset inside
temperature is reached. The
air conditioner works only when the engine is running. The higher the engine rpm, the more
intensive the cooling effect.
Air from inside the car is drawn through the evaporator for cooling
and then reenters the car interior through the air outlets. Proper
operation of the air conditioner is guaranteed only if the windows and roof
are closed and the outlet nozzles at the side and center are fully opened. If
the vehicle has been standing for a fairly long time in intense sunlight, it
is recommended that the inside of the vehicle be thoroughly ventilated by
opening the car windows and switching on the air conditioner. When
the air conditioner is switched on, additional cooled air reaches the glove
compartment through a nozzle. In
damp weather it is recommended to switch on the air conditioner, even if the
outside temperature is low. This
dehumidifies the air and prevents the windshield from fogging up. Important
notes:
The following controls make possible optimum
adjustment of the unit to your individual 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 temperature.
The value on the temperature scale corresponds to an average inside
temperature. No
automatic temperature control takes place in program settings [off] and
[defrost]. 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
automatically controlled air conditioner.
Additional vaporizer for increased cooling output
In
vehicles with increased cooling unit output, there is an additional vaporizer
with a fan installed instead of the floor console. When
the air conditioner switch is pressed in, and the air conditioner is turned
on, the back vaporizer can be switched on by turning the button at the left
in the center console to the right.
Fan speeds from 1 to 3 can be adjusted. Turning the button at the right to the right increases the
cooling output from the rear vaporizer. The
inside air is drawn in through the rear grid, cooled, and circulated in the
floor area. If the AC switch has
not been pushed in, only circulation of the air provided. Checking
refrigerant level Check
the refrigerant level in the reservoir at least once a year because the fluid
diminishes gradually during operation. Turn
on the air conditioner and observe refrigerant level through sight glass in
the reservoir. Occasional
bubbles are normal. Foam
or a constant stream of bubbles indicate that the system does not contain
enough refrigerant. In
case the system requires recharging, contact your Porsche dealer. He has qualified personnel and the
necessary equipment. |
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