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Mercedes S-Class Coupe - 2015 Manual

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Warning/
indicator
lamp
NN Signal type
Possible causes/consequences and MM Solutions
?
N The red coolant warning lamp comes on while the engine is running.
The coolant level is too low.
If the coolant level is correct, the airflow to the engine radiator may be blocked
or the electric engine radiator fan may be malfunctioning.
The coolant is too hot and the engine is no longer being cooled sufficiently.
X
Observe the additional display messages in the multifunction display.
X
Pull over and stop the vehicle safely and switch off the engine, paying
attention to road and traffic conditions.
X
Secure the vehicle against rolling away (Y page 166).
X
Leave the vehicle and keep a safe distance from the vehicle until the engine
has cooled down.
X
Check the coolant level and add coolant, observing the warning notes
(Y page 322).
X
If you need to add coolant more often than usual, have the engine coolant
system checked.
X
Make sure that the air supply to the engine radiator is not blocked, e.g. by
snow, slush or ice.
X
Do not start the engine again until the coolant temperature is below 257 ‡
(125 †). Otherwise, the engine could be damaged.
X
Drive to the nearest qualified specialist workshop.
X
Avoid subjecting the engine to heavy loads, e.g. driving in mountainous
terrain, and stop-and-go traffic.
?
N The red coolant warning lamp comes on while the engine is running. A
warning tone also sounds.
The coolant temperature has exceeded 255 ‡ (124 †). The airflow to the
engine radiator may be blocked or the coolant level may be too low.
G
WARNING
The engine is not being cooled sufficiently and may be damaged.
Do not drive when your engine is overheated. This can cause some fluids which
may have leaked into the engine compartment to catch fire.
Steam from the overheated engine can also cause serious burns which can
occur just by opening the hood.
There is a risk of injury.
X
Observe the additional display messages in the multifunction display.
X
Pull over and stop the vehicle safely and switch off the engine, paying
attention to road and traffic conditions.
X
Secure the vehicle against rolling away (Y page 166).
288
Warning and indicator lamps in the instrument cluster
On-board computer and displays
… 290 …


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