Mercedes-Benz SLK-Class 2008 Owner's Manual page 205

Practical advice
Troubleshooting
Problem
A coolant temperature of over
120 °C is displayed.
202
Possible cause/consequence
The coolant level is too low. The
coolant is too hot and the engine
is no longer being cooled suffi-
ciently.
If the coolant level is correct, the
radiator fan may be faulty. The
coolant is too hot and the engine
is no longer being cooled suffi-
ciently.
Suggested solutions
Stop as soon as possible and allow the engine and the coolant to
X
cool down.
Check the coolant level ( page 154). Observe the warning notes
X
Y
as you do so and top up the coolant if necessary.
If the coolant temperature is less than 120°C, you can continue
X
driving to the nearest qualified specialist workshop.
Avoid heavy loads on the engine as you do so, e.g. when driving on
X
mountain roads and stop/start driving.