2010 MERCEDES-BENZ R320 coolant reservoir

hot fluid and steam will be blown out under
pressure.
R Do not spill antifreeze on hot engine parts.
Antifreeze contains ethylene glycol which
may burn if it comes into contact with hot
engine parts. X
Using a rag, slowly open cap ;
approximately 1
/ 2 turn to relieve excess
pressure.
X Continue turning cap ; counterclockwise
and remove it.
The coolant level is correct if the level
R for cold coolant: reaches marking
bar : in coolant expansion tank =
R for warm coolant: is approximately 0.6 in
(1.5 cm) higher
X Add coolant as required.
X Screw cap ; back on and tighten it.
For more information on coolant, see the
“Technical data” section ( Y page 351) and
(Y page 355). Washer system and 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. !
Always use washer solvent/antifreeze
where temperatures may fall below
freezing point. Failure to do so could result
in damage to the washer system/fluid
reservoir.
! Only use washer fluid which is suitable for
plastic lenses. Improper washer fluid can
damage the plastic lenses of the
headlamps.
! Do not use distilled or deionized water in
the washer fluid reservoir. Otherwise, the
washer fluid level sensor could be
damaged. Fluid for the washer system, rear window
washer system, and the headlamp cleaning
system is supplied from washer fluid
reservoir ;.
During all seasons, use MB Windshield
Washer Concentrate “MB SummerFit”. Mix it
with water or premixed washer solvent/
antifreeze depending on the ambient
temperature (
Y page 357).
X Opening washer fluid reservoir: Pull tab
of cap : upwards.
X Refill the washer fluid reservoir.
X Closing washer fluid reservoir: Press
cap : onto filler hole until it engages.
For more information, see “Washer system
and headlamp cleaning system”
(Y page 351). 226
Engine compartmentOperation
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Display messages
Possible causes/consequences and
X Solutions+ Key Not
Detected
(message
appears in
white) The SmartKey with KEYLESS-GO is momentarily not detected.
X
Change the position of the SmartKey in the vehicle.
X If necessary, remove the KEYLESS-GO button from the
starter switch ( Y page 80).
X Operate the vehicle with the SmartKey in the starter switch. + Pull
starting
button
out then
insert
key. The SmartKey with KEYLESS-GO is permanently not detected.
X
Remove the KEYLESS-GO button from the starter switch
(Y page 80).
X Operate the vehicle with the SmartKey in the starter switch.
X Contact an authorized Mercedes-Benz Center. ~ Bluetooth
Ready The telephone has not yet been connected to the COMAND
system via Bluetooth
®
.
X Connect the telephone to the COMAND system via
Bluetooth ®
. ¥ Top Up
Washer
Fluid
The fluid level has dropped to approximately
1
/ 3 of total
reservoir capacity.
X Add washer fluid ( Y page 226).Engine
Display messages
Possible causes/consequences and
X Solutions+ Top Up
Coolant
See
Operator’s
Manual The coolant level is too low.
X
Add coolant (Y page 225).
X If you have to add coolant frequently, have the cooling
system checked at an authorized Mercedes-Benz Center. G
Warning!
Do not spill antifreeze on hot engine parts. Antifreeze contains ethylene glycol which may burn
if it comes into contact with hot engine parts. You could be seriously burned.
! Do not ignore the low engine coolant level warning. Extended driving with the message
and
symbol displayed may cause serious engine damage not covered by the Mercedes-Benz
Limited Warranty.
Do not drive without sufficient amount of coolant in the cooling system. The engine will
overheat causing major engine damage. 290
Vehicle status messages in the multifunction display
Practical hints
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immediately. If AdBlue
®
has crystallized
already, use cold water and a sponge.
AdBlue ®
residues will crystallize and soil
the affected surfaces.
High ambient temperatures If AdBlue
®
in the reservoir heats up to above
122‡ (50†) for a long period of time, for
example due to direct sunlight, ammonia gas
vapors may escape when opening the
AdBlue ®
tank. G
Warning!
When opening the filler cap of the AdBlue ®
tank ammonia gas vapors may escape. Refill
AdBlue ®
in a well ventilated area only.
Ammonia

gas vapors have a pungent odor and
are particularly irritating for your skin,
mucous membranes, and eyes. Inhaling
ammonia gas vapors will cause burning eyes,
nose, and throat, as well as coughing and
watering eyes.
Low ambient temperatures AdBlue
®
freezes at a temperature of
approximately 12‡ (-11†). Your vehicle is
factory

equipped with an AdBlue ®
preheating
system. The vehicle can thus be operated at
temperatures below 12‡ (-11†).
Special additives !
Only use AdBlue ®
complying with
ISO 22241. Do not add additives to
AdBlue ®
and do not dilute AdBlue ®
with
water.

Otherwise, the BlueTEC exhaust gas
aftertreatment system could be damaged.
Damage caused by using additives or
diluting with water are not covered by the
Mercedes-Benz Limited Warranty.
Purity The purity of AdBlue
®
is of particular
importance for avoiding malfunctions in the
exhaust gas aftertreatment. If AdBlue
®
is pumped out of the tank, e.g.
during repair work, the same liquid must not
be used to refill the tank as its purity is no
longer guaranteed.
! Impurities caused for example by other
service

products, cleaning agents, and dust
result in increased emissions,
malfunctions, catalyst damage, or engine
damage. Coolants
The engine coolant is a mixture of water and
anticorrosion/antifreeze, which provides:
R Corrosion protection
R Freeze protection
R Boiling

protection (by increasing the boiling
point)
The cooling system was filled at the factory
with a coolant providing freeze protection to
approximately -35‡ (-37†) and corrosion
protection.
! Add premixed coolant solution only.
Adding water and MB 325.0 Anticorrosion/
Antifreeze separately from each other,
could cause engine damage not covered by
the Mercedes-Benz Limited Warranty.
If the antifreeze mixture is effective to -35‡
(-37†), the boiling point of the coolant in the
pressurized cooling system is reached at
approximately 266‡ (130†).
The coolant solution must be used year round
to provide the necessary corrosion protection
and increase boil-over protection. Refer to
the Maintenance Booklet for replacement
interval.
Coolant system design and coolant used
determine the replacement interval. The
replacement interval published in the
Maintenance Booklet is only applicable if
MB 325.0 Anticorrosion/Antifreeze solution
or other Mercedes-Benz approved products
of equal specification are used to renew the Fuels, coolants, lubricants, etc.
355
Technical data
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