Mercedes-Benz G-Class Operator's Manual page 246

Warning and indicator lamps in the instrument cluster
244
Problem
?
The red coolant warn-
ing lamp comes on
while the engine is run-
ning.
?
The red coolant warn-
ing lamp comes on
while the engine is run-
ning. A warning tone
also sounds.
Possible causes/consequences and M M Solutions
The coolant level is too low.
! Avoid making long journeys with too little coolant in the engine
cooling system. The engine will otherwise be damaged.
If the coolant level is correct, the airflow to the engine radiator may
be blocked or the electric engine radiator fan may be malfunc-
tioning.
The coolant is too hot and the engine is no longer being cooled
sufficiently.
Observe the additional display messages in the multifunction
X
display.
Pull over and stop the vehicle safely and switch off the engine,
X
paying attention to road and traffic conditions.
Apply the parking brake.
X
Leave the vehicle and keep a safe distance from the vehicle until
X
the engine has cooled down.
Check the coolant level and add coolant, observing the warning
X
notes ( page 278).
Y
If you need to add coolant more often than usual, have the
X
engine coolant system checked.
Make sure that the air supply to the engine radiator is not
X
blocked, e.g. by snow, slush or ice.
Do not start the engine again until the coolant temperature is
X
below 248 ‡ (120 †). Otherwise, the engine could be damaged.
Drive to the nearest qualified specialist workshop.
X
Avoid subjecting the engine to heavy loads, e.g. driving in moun-
X
tainous terrain, and stop-start driving.
The coolant temperature has exceeded 248 ‡ (120 †). The air-
flow 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.