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Practical hints
What to do if ...
During severe operating conditions, e.g.
stop-and-go traffic, the coolant tempera-
ture may rise close to 248°F (120°C).
Problem Possible cause/consequence Suggested solution
D The red coolant temperature
warning lamp comes on while
the engine is running.
There is insufficient coolant in the reservoir. ̈ Immediately add coolant to prevent en-
gine from overheating (
୴ page 255).
If this warning lamp comes on frequently,
there is a leak in the cooling system.
̈ Have the cooling system checked by
an authorized Mercedes-Benz Center.
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 driv-
ing 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
the engine is running and you
hear a warning sound.
The coolant temperature has exceeded
248°F (120°C).
̈ Stop as soon as possible in a safe loca-
tion and allow the engine and coolant
to cool down.
Warning! G
Driving when your engine is overheated 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.
Stop the vehicle in a safe location away from
other traffic. Turn off the engine, get out of
the vehicle and do not stand near the vehicle
until the engine has cooled down.
!
The engine should not be operated with the
coolant temperature above 248°F (120°C). Do-
ing so may cause serious engine damage which
is not covered by the Mercedes-Benz Limited
Warranty.