Porsche 2006 Cayman Owner's Manual page 177

3. Cover the expansion tank cap with a thick rag.
Open cap slowly and carefully and allow over-
pressure to escape.
Then unscrew cap completely.
4. If necessary, add a mixture of equal parts anti-
freeze and water.
Do not fill over the "max" marking.
Antifreeze in coolant:
50% gives protection down to –31°F/–35°C
60% gives protection down to –58°F/–50°C
5. Screw cap firmly on.
6. Close service flap.
If in an emergency pure water has been added, the
mix ratio must be corrected at an authorized
Porsche dealer.
Marked loss of coolant indicates leakage in the
cooling system.
The cause should immediately be remedied at an
authorized Porsche dealer.
Radiator fans
The radiator and radiator fans are in the front of
the vehicle.
Warning!
Risk 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.
Maintenance, Car Care
177