Operation Manual

Let the engine cool down before you open the
cap. Wear gloves and eye protection. Slowly
open the cap to relieve pressure.
G
WARNING
Windshield washer concentrate could ignite if
it comes into contact with hot engine compo-
nents or the exhaust system. There is a risk of
fire and injury.
Make sure that no windshield washer con-
centrate is spilled next to the filler neck.
Checking coolant level
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
Turn the SmartKey to position 2 in the ignition
lock (
Y page 146).
or
X
On vehicles with KEYLESS-GO, press the
Start/Stop button twice (
Y page 146).
X
Check the coolant temperature display in the
instrument cluster (
Y page 236).
The coolant temperature must be below
158 ‡ (70 †).
X
Turn the SmartKey to position 0 in the ignition
lock (
Y page 146).
or
X
On vehicles with KEYLESS-GO, pull the Start/
Stop button from the ignition lock
(
Y page 146).
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 expan-
sion tank ;.
X
If necessary, add coolant that has been tested
and approved by Mercedes-Benz.
X
Replace cap : and turn it clockwise as far as
it will go.
For further information on coolant, see
(
Y page 392).
Adding washer fluid to the windshield
washer system
X
To open: pull cap : upwards by the tab and
open.
X
Add the premixed washer fluid.
X
To close: press cap : onto the filler neck
until it engages.
If the washer fluid level drops below the recom-
mended minimum of 1 liter, a message appears
in the multifunction display prompting you to
add washer fluid (
Y page 285).
Further information on windshield washer fluid/
antifreeze (
Y page 393).
ASSYST PLUS
Service message
The ASSYST PLUS service interval display
informs you of the next service due date.
ASSYST PLUS
333
Maintenance and care
Z