Mercedes-Benz 2012 A-Class, Owner'S Manual

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Display messages Possible causes/consequences and
M
Solutions
?
Coolant Stop vehi‐
cle Switch engine
off
The coolant is too hot.
A warning tone also sounds.
G
WARNING
Never drive with an overheated engine. Driving when your engine
is overheated can cause some fluids which may have leaked into
the engine compartment to catch fire.
Steam from an overheated engine can cause serious burns, which
can occur just by opening the bonnet.
There is a risk of injury.
X
Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine.
X
Secure the vehicle against rolling away (
Y
page 162).
X
Wait until the engine has cooled down.
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 display message goes out
and the coolant temperature is below 120 †. The engine may
otherwise be damaged.
X
Pay attention to the coolant temperature display.
X
If the temperature increases again, visit a qualified specialist
workshop immediately.
Under normal operating conditions and with the specified coolant
level, the coolant temperature may rise to 120 †.
# The battery is not being charged.
A warning tone also sounds.
Possible causes:
R
faulty alternator
R
torn poly-V-belt
R
a malfunction in the electronics
X
Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine.
X
Open the bonnet.
X
Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise overheat.
X
Consult a qualified specialist workshop.
If the poly-V-belt is OK:
X
Visit a qualified specialist workshop immediately.
244
Display messages
On-board computer and displays