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Practical hints
What to do if …
Problem Possible cause Suggested solution
/ The yellow coolant warning lamp
comes on when the engine is
running.
The coolant is to hot.
The coolant level is too low.
̈ Stop as soon as possible and allow
the engine and coolant to cool down.
̈ Check the coolant level and add
coolant if necessary (
୴ page 227).
If the warning lamp comes on frequently,
there is a leak in the cooling system.
̈ Have the cooling system checked by
an authorized Mercedes-Benz Light
Truck Center.
The coolant temperature gauge is above
248°F (120°C).
The coolant level is too low. ̈ Stop as soon as possible and allow
the engine and coolant to cool down.
̈ Add coolant to prevent engine from
overheating (
୴ page 227).
If the coolant level is correct, the electrical
radiator fan may be broken.
̈ If the coolant temperature is below
the red zone, immediately to the near-
est authorized Mercedes-Benz Light
Truck Center.
Avoid high engine loads (e.g. driving
uphill) and stop-and-go driving.