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Practical hints
What to do if …
Problem Possible cause/consequence Suggested solution
D The red coolant 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 ra-
diator fan may be broken.
̈ Immediately add coolant to prevent
engine from overheating
(
୴ page 288).
̈ 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 warning lamp
comes on when the engine is
running 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.