Cooling System - Porsche 968 Driver Manual

Cooling System
The cooling system is provided at the factory
with a mixture of decalcified water and anti-
freeze which simultaneously protects against
frost down to -30°C (Nordic countries - 40°C)
as well as against corrosion.
Radiator Fan
The radiator fan is electrically driven and is con-
trolled in accordance with the coolant tempera-
ture .
If the engine is still warm after being switched
off, therefore, the radiator fari may continue to
run or even switch itself back on.
Checking Coolant Level
The coolant level should be checked at regular
intervals - at least before a long journey - at
the expansion tank.
There must always be coolant in the expansion
tank.
The filler cap need not be removed to check
coolant level because the expansion tank is
transparent.
Only when the coolant level falls below the "mini·
mum" level must it be topped up.
Topping up Coolant
To remove the cap proceed in two steps. If the
engine is hot, release excess pressure by turn·
ing the cap to the first stop. Protect your fin·
gers! The cap can then be turned further to
remove it.
To guard against corrosion and prevent scale
forming in the cooling system, the mixture
strength of cooling fluid should not be altered,
so even in warm weather, never top up the sys-
tem with just water.
The system should only be topped up with a
mixture of soft water and cooling system addi·
tive. For mixing ratios see the chapter "Filling
Capacities". To avoid damaging the engine, cold
fluid should only be added to a cold engine.
Note
There should seldom be a need to top up this
sealed cooling system. If the level drops consid·
erably, this usually indicates that there is a leak.
In this case, have the cooling system checked
by an Official Porsche Centre without delay.
Warning!
Do not remove the expansion cap while the
engine is hot, otherwise you may be scalded.
With the engine cold, fill the expansion tank so
that the level is between the "minimum" and
"maximum" marks.
If too much coolant is added then the excess
will escape as the engine temperature in·
creases, via the relief valve in the filler cap.
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