Mercedes-Benz S-Class Coupe, Owner'S Manual

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Warning/
indicator
lamp
N N Signal type
Possible causes/consequences and M M 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
Stop the vehicle immediately, paying attention to road and traffic condi-
tions, and switch off the engine.
X
Secure the vehicle against rolling away (
Y
page 178).
X
Leave the vehicle and keep a safe distance from the vehicle until the engine
has cooled down.
X
Check the coolant level and top up the coolant, observing the warning notes
(
Y
page 340).
X
If you have to top up the coolant frequently, have the engine cooling system
checked.
X
Make sure that the air supply to the engine radiator is not blocked, e.g. by
frozen slush.
X
Do not start the engine again until the coolant temperature is below 125 †.
The engine may otherwise be damaged.
X
Drive to the nearest qualified specialist workshop.
X
Avoid putting the engine under heavy load as you do so, e.g. driving in
mountainous terrain and stop-start traffic.
? N The red coolant warning lamp comes on while the engine is running. A
warning tone also sounds.
The coolant temperature has exceeded 124 †. The airflow to the engine radi-
ator may be blocked or the coolant level may be too low.
G WARNING
The engine is not being cooled sufficiently and may be damaged.
Never drive with an overheated engine. Driving when your engine is overhea-
ted can cause some fluids which may have leaked into the engine compart-
ment to catch fire.
In addition, steam from an overheated engine can cause serious burns, which
can occur just by opening the bonnet.
There is a risk of injury.
X
Observe the additional display messages in the multifunction display.
X
Stop the vehicle immediately, paying attention to road and traffic condi-
tions, and switch off the engine.
X
Secure the vehicle against rolling away (
Y
page 178).
308
Warning and indicator lamps in the instrument cluster
On-bo
ard
computer
and
displays