Porsche Cayenne Owner's Manual page 256

Checking the coolant level when a warning
messages is shown on the multi-purpose
display of the instrument panel
Warning!
Danger of serious personal injury or death
from scalding. Coolant is hazardous to your
health, and may be fatal if swallowed.
f Do not open the cap of the expansion tank
while the engine is hot.
f Allow the engine to cool down before opening
the cap and protect your hands, arms and face
from any possible escape of hot coolant.
f Keep coolant out of children's reach.
f Also, keep coolant away from your pets. They
can be attracted to it should there be a spill, or
to used coolant left in an open container.
Coolant can be deadly to pets if consumed.
256
Maintenance and Car Care
1. Remove cover.
2. If the engine is hot, cover the the expansion
tank cap with a cloth.
Open cap carefully and allow any overpressure
to escape.
Then unscrew cap completely.
3. Read the coolant level.
Top up with coolant if necessary.
Only add a mixture of anti-freeze and water in
equal parts.
Antifreeze in coolant:
50% provides anti-freeze protection down to
-31 °F (-35 °C).
Do not exceed the max-mark.
Note on operation
f If the coolant level exceeds the max-mark
when the engine is hot, check the coolant level
again when the engine is cold.
4. Screw the cap closed firmly and put on the
cover.
5. Have the cooling system checked by an
authorized Porsche dealer.
Maintenance Notes
If in an emergency pure water has been added, the
mixture ratio must be corrected at an authorized
Porsche dealer.
f Marked loss of coolant indicates leakage in the
cooling system.
The cause should be remedied at an
authorized Porsche dealer immediately.
Radiator fans
The radiator and radiator fans are in the front of
the car.
Warning!
Danger of injury. The fans can start running
as a function of temperature, even with the
engine switched off.
f Exercise extreme caution when working in the
area of the radiator fans.