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WARNING
•
Do not open the filler cap when the en-
gine is hot because of the danger of
scalding. Allow the engine to cool down.
Protect your hands, arms and face.
•
Using a thick rag, open the cap carefully
and only enough to allow excess pres-
sure to escape before removing the cap.
To avoid damage to the engine, only add
cold antifreeze and cold water to the cool-
ing system when the engine is also cold.
A warm engine should only be topped up if
the coolant level has dropped appreciable
below the manufacturing seam. Too much
added coolant will escape through the pres-
sure cap when coolant warms up.
For more details see "coolant temperature
gauge and coolant temperature warning
light".
Fan control
This device permits cooling output to be
adapted to the operational status of the en-
gine. A control unit processes the informa-
tion it receives from the sensors in the en-
gine compartment and passes the approp-
riate signals to the fans. If more air is needes,
the speed of the two continuously adjustable
70
electric cooling fans is increased. If the
temperature of the coolant drops below 75
°C, the fans are switched off; in the event of
a fault, they operate at maximum speed.
The system has both auto and remote super-
vision. Should a component fail, the coolant
temperature warning light gives indication of
excessively high coolant temperatures and
a fault message appears in the information-
system display.
When the engine is warm, the fans may con-
tinue to run after the ignition key has been
removed. To avoid any danger of injury, the
fans are switched off when the engine-com-
partment hood is opened. However, this pro-
tective measure to prevent the fans starting
suddenly while the hood is open is only fully
operative as long as the key is removed from
the ignition.
Winter operation
At the beginning of the winter season, have
the coolant checked for anti-freeze concent-
ration.
The ratio between water and anti-freeze,
necessary to prevent freezing, depends on
the anticipated outside temperatures. The
ratios can be taken from the mixing chart
listed under "Filling Capacities" or from the
container of the antifreeze manufacturer.
Increasing the anti-freeze in the coolant
further than shown on the container is not
only uneconomical, it is also detrimental
to engine cooling.
Intensive windshield cleaning
system reservoir
The reservoir is located in the engine com-
partment beneath the windshield.
To prevent damage and discoloration to
paintwork, you should use only "Porsche
Special Silicone Remover".
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