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Additional service products
Checking coolant level
G
WARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and
touch only the components described in the
following.
G
WARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
G
WARNING
The cooling system is pressurized, particularly
when the motor is warm. If you open the cap,
you could be scalded if hot coolant sprays out.
There is a risk of injury.
Let the engine cool down before you open the
cap. Wear protective gloves and protective
eyewear when opening. Open the cap slowly
to release pressure.
!
Before starting your journey, make sure that
all engine covers are installed. Otherwise, the
engine can be damaged, e.g. through over-
heating.
Example
X
Park the vehicle on a level surface.
Only check the coolant level when the vehicle
is on a level surface and the engine has cooled
down.
X
Select key position 2 with the Start/Stop
button.
X
Check the coolant temperature display in the
instrument cluster.
The coolant temperature must be below
158 ‡ (70 †).
X
Select key position u with the Start/Stop
button.
X
Remove engine cover : upwards on both
sides.
X
Slowly turn cap ; half a turn counter-clock-
wise to allow excess pressure to escape.
X
Turn cap ; further counter-clockwise and
remove it.
If the coolant is at the level of the marker bar
in the filler neck when cold, there is enough
coolant in coolant expansion tank =.
If the coolant level is approximately 0.6 in
(1.5 cm) above the marker bar in the filler
neck when warm, there is enough coolant in
coolant expansion tank =.
X
If necessary, add coolant that has been tested
and approved by Mercedes-Benz.
Engine compartment
239
Maintenance and care
Z
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