radiator cap MERCEDES-BENZ CLK63AMG 2008 C209 Owner's Manual

382 Practical hints
What to do if …?
ProblemPossible cause/consequenceSuggested solution
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The yellow engine malfunction
indicator lamp comes on while
driving.A loss of pressure has been
detected in the fuel system. The fuel
cap may not be closed properly or
the fuel system may be leaky.Check the fuel cap (page 320).
If it is not closed properly:
Close the fuel cap.
If it is closed properly:
Have the fuel system checked at an autho-
rized Mercedes-Benz Center.
•The red coolant warning lamp
comes on when the engine is run-
ning.There is insufficient coolant in the
reservoir.Add coolant to prevent engine from overheat-
ing (
page 328).
If this warning lamp comes on fre-
quently, there is a leak in the cooling
system.Have the cooling system checked.
If the coolant level is correct, the
electric radiator fan may be broken.If the coolant temperature is below 248 °F
(120 °C), you can continue driving to the
nearest authorized Mercedes-Benz Center.
Avoid high engine loads (e.g. driving uphill)
and stop-and-go driving.