Mercedes-Benz C-Class Operator's Manual page 292

Engine compartment
290
Checking and adding other service
products
Checking the coolant level
G
WARNING
In order to avoid any potentially serious burns:
use extreme caution when opening the
R
hood if there are any signs of steam or
coolant leaking from the cooling system, or
if the coolant temperature display indicates
that the coolant is overheated.
do not remove the pressure cap on the
R
coolant reservoir if the coolant temperature
is above 158 ‡ (70 †). Allow the engine to
cool down before removing the cap. The
coolant reservoir contains hot fluid and is
under pressure.
using a rag, slowly turn the cap
R
1
approximately /
pressure. If opened immediately, scalding
hot fluid and steam will be blown out under
pressure.
do not spill antifreeze on hot engine parts.
R
Antifreeze contains ethylene glycol which
may burn if it comes into contact with hot
engine parts.
Only check the coolant level when the vehicle
is on a level surface and the engine has cooled
down.
Turn the SmartKey to position
X
2 ( page 141) in the ignition lock.
Y
On vehicles with KEYLESS-GO, press the
Start/Stop button twice (
Check the coolant temperature display in
X
the instrument cluster.
The coolant temperature must be below
158 ‡ (70 †).
turn to relieve excess
2
page 142).
Y
I n f o r ma t i o n P r o v i d e d b y :
Slowly turn cap : half a turn counter-
X
clockwise and allow excess pressure to
escape.
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 coolant expansion tank ;.
If necessary, add coolant that has been
X
tested and approved by Mercedes-Benz.
Replace cap : and turn it clockwise as far
X
as it will go.
For further information on coolant, see
( page 356).
Y
Adding washer fluid to the windshield
washer system/headlamp cleaning
system
G WARNING
Washer solvent/antifreeze is highly
flammable. Do not spill washer solvent/
antifreeze on hot engine parts, because it may
ignite and burn. You could be seriously
burned.