Mercedes-Benz C-Class Operator's Manual page 335

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
Park the vehicle on a level surface.
X
Only check the coolant level when the vehicle
is on a level surface and the engine has cooled
down.
Turn the SmartKey to position 2 in the ignition
X
lock ( page 146).
Y
or
On vehicles with KEYLESS-GO, press the
X
Start/Stop button twice (
Check the coolant temperature display in the
X
instrument cluster (
Y
The coolant temperature must be below
158 ‡ (70 †).
Turn the SmartKey to position 0 in the ignition
X
lock ( page 146).
Y
or
On vehicles with KEYLESS-GO, pull the Start/
X
Stop button from the ignition lock
( page 146).
Y
Slowly turn cap : half a turn counter-clock-
X
wise to allow excess pressure to escape.
page 146).
Y
page 236).
Turn cap : further counter-clockwise and
X
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 ;.
If necessary, add coolant that has been tested
X
and approved by Mercedes-Benz.
Replace cap : and turn it clockwise as far as
X
it will go.
For further information on coolant, see
( page 392).
Y
Adding washer fluid to the windshield
washer system
To open: pull cap : upwards by the tab and
X
open.
Add the premixed washer fluid.
X
To close: press cap : onto the filler neck
X
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 ( page 285).
Y
Further information on windshield washer fluid/
antifreeze ( page 393).
Y
ASSYST PLUS
Service message
The ASSYST PLUS service interval display
informs you of the next service due date.
ASSYST PLUS
Z
333