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Practical hints
What to do if …
Problem Possible cause/consequence Suggested solution
D The red coolant temperature
warning lamp comes on when
the engine is running.
There is insufficient coolant in the reservoir.
If this warning lamp comes on frequently,
there is a leak in the cooling system.
If the coolant level is correct, the electric
radiator fan may be broken.
̈ Immediately add coolant to prevent
engine from overheating
(
୴ page 290).
̈ Have the cooling system checked.
̈ 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.
D The red coolant temperature
warning lamp comes on while
driving and you hear a warning
sound.
The coolant temperature has exceeded
248°F (120°C).
̈ Stop in a safe location as soon as pos-
sible and allow the engine and coolant
to cool down.
Warning! G
Driving when your engine is badly overheat-
ed can cause some fluids which may have
leaked into the engine compartment to
catch fire. You could be seriously burned.
Steam from an overheated engine can cause
serious burns which can occur just by open-
ing the engine hood. Stay away from the en-
gine if you see or hear steam coming from it.
Turn off the engine, get out of the vehicle
and do not stand near the vehicle until the
engine has cooled down.