Mercedes-Benz E-Class 2010 Owner's Manual page 244

Warning and indicator lamps in the instrument cluster
Problem
8
The yellow reserve fuel
warning lamp lights up
while the engine is run-
ning.
?
The red coolant warn-
ing lamp lights up while
the engine is running
and the coolant tem-
perature gauge is at the
start of the scale.
?
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 Solutions
The fuel level has fallen below the reserve range.
The fuel tank must be filled at least to the reserve fuel level to
prevent impairment to the running of the engine.
Refuel at the nearest filling station.
X
The temperature sensor for the coolant temperature gauge is
faulty.
The coolant temperature is no longer being monitored. There is a
risk of engine damage if the coolant temperature is too high.
Pull over and stop the vehicle safely and switch off the engine,
X
paying attention to road and traffic conditions. Do not continue
driving under any circumstances.
Engage the parking brake.
X
Consult a qualified specialist workshop.
X
The coolant level is too low.
If the coolant level is correct, the airflow to the radiator may be
blocked or the electric radiator fan may be malfunctioning.
The coolant is too hot and the engine is no longer being cooled
sufficiently.
Pull over and stop the vehicle safely and switch off the engine,
X
paying attention to road and traffic conditions.
Allow the engine and coolant to cool.
X
Check the coolant level and top up the coolant (
X
Observe the warning notes.
If the coolant needs topping up more often than usual, have the
X
engine coolant system checked.
Make sure that the air supply to the radiator is not blocked, e.g.
X
by snow, slush or ice.
If the coolant temperature is less than 120 †, you can continue
X
driving to the nearest qualified specialist workshop.
Avoid subjecting the engine to heavy loads, e.g. driving in moun-
X
tainous terrain, and stop-start driving.
The coolant temperature has exceeded 120 †. The airflow to the
radiator may be blocked or the coolant level may be too low.
The engine is not being cooled sufficiently and may be damaged.
Pull over and stop the vehicle safely and switch off the engine,
X
paying attention to road and traffic conditions.
Allow the engine and coolant to cool.
X
241
page 261).
Y
Z