Coolant - Mercedes-Benz 2009 CLS-Class Operator's Manual

Problem
Ì The red coolant tempera-
ture warning lamp comes
on when the engine is run-
ning.
Ì The red coolant tempera-
ture warning lamp comes
on when the engine is run-
ning and you hear a warn-
ing sound.
G Warning!
Driving when your engine is overheated can
cause some fluids which may have leaked
into the engine compartment to catch fire.
You could be seriously burned.
Possible cause/consequence
There is insufficient coolant in the
reservoir.
If this warning lamp comes on fre-
quently, there is a leak in the cool-
ing system.
If the coolant level is correct, the
electric radiator fan may be bro-
ken.
The coolant temperature has
exceeded 248‡ (120†).
Steam from an overheated engine can
cause serious burns which can occur just
by opening the engine hood. Stay away
Suggested solutions
X
Immediately add coolant to prevent engine from overheating
Y
( page 202).
X
Have the cooling system checked.
X
If the coolant temperature is below 248‡ (120†), you can con-
tinue driving to the nearest authorized Mercedes-Benz Center.
X
Avoid high engine loads (e.g. driving uphill) and stop-and-go driving.
X
Stop in a safe location as soon as possible and allow the engine
and coolant to cool down.
from the engine if you see or hear steam
coming from it.
Stop the vehicle in a safe location away
from other traffic. Turn off the engine, get
out of the vehicle and do not stand near the
vehicle until the engine has cooled down.
Practical hints
What to do if ...
Z
299