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If you need to do any work inside the engine
compartment:
R
switch off the ignition
R
never reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area
R
remove jewelry and watches
R
keep items of clothing and hair, for exam-
ple, away from moving parts
G
WARNING
The cooling system is pressurized, particu-
larly 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 protec-
tive eyewear when opening. Open the cap
slowly to release pressure.
Example
X
Park the vehicle on a level surface.
Only check the coolant level when the vehi-
cle is on a level surface and the engine has
cooled down.
X
Turn the SmartKey to position 2 in the igni-
tion lock (Y page 118).
On vehicles with KEYLESS-GO, press the
Start/Stop button twice (Y page 118).
X
Check the coolant temperature gage in the
multifunction display.
The coolant temperature must be below
158 ‡ (70 †).
X
Turn the SmartKey to position u
(Y page 118) in the ignition lock.
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 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 marker bar = in the filler
neck when warm, there is enough coolant in
expansion tank ;.
X
If necessary, add coolant that has been tes-
ted and approved by Mercedes-Benz.
X
Replace cap : and turn it clockwise as far
as it will go.
Further information on coolant (Y page 301).
Windshield washer system
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
If you open the hood when the drive system
has overheated or during a fire in the engine
compartment, you could come into contact
with hot gases or other escaping operating
fluids. There is a risk of burns.
Let the overheated components cool down
before opening the hood. In the event of a
fire in the engine compartment, keep the
hood closed and call the fire service.
G
WARNING
Windshield washer concentrate is highly
flammable. If windshield washer concentrate
gets onto hot components of the engine or
the exhaust system, it can ignite. There is a
risk of fire and injury.
Engine compartment
243
Maintenance and care
Z
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