engine MERCEDES-BENZ CLS COUPE 2012 Owners Manual

Problem Possible causes/consequences and
M Solutions
?
The red coolant warn-
ing lamp comes on
while the engine is run-
ning.
The coolant level is too low.
If the coolant level is correct, the airflow to the engine radiator
may be blocked or the electric engine radiator fan may be mal-
functioning.
The coolant is too hot and the engine is no longer being cooled
sufficiently.
X
Observe the additional display messages in the multifunction
display.
X Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine.
X Secure the vehicle against rolling away (Y page 159).
X Leave the vehicle and keep asafe distance from the vehicle until
the engine has cooled down.
X Check the coolant level and top up the coolant, observing the
warning notes (Y page 299).
X If you have to top up the coolant frequently, have the engine
cooling system checked.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by frozen slush.
X Do not start the engine again until the coolant temperature is
under 120 †. The engine may otherwise be damaged.
X Drive to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in
mountainous terrain and stop-start traffic. ?
The red coolant warn-
ing lamp comes on
while the engine is run-
ning.
Awarning tone
also sounds. The coolant temperature has exceeded 120 †. The airflow to the
engine radiator may be blocked or the coolant level may be too
low.
G WARNING
The engine is not being cooled sufficiently and may be damaged.
Never drive with an overheated engine. Driving when your engine
is overheated can cause some fluids which may have leaked into
the engine compartmen ttocatch fire.
Steam from an overheated engine can cause serious burns, which
can occur just by opening the bonnet.
This poses arisk of injury.
X Observe the additional display messages in the multifunction
display.
X Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine.
X Secure the vehicle against rolling away (Y page 159).268
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

Problem Possible causes/consequences and
M Solutions
X
Leave the vehicle and keep asafe distance from the vehicle until
the engine has cooled down.
X Check the coolant level and top up the coolant, observing the
warning notes (Y page 299).
X If you have to top up the coolant frequently, have the engine
cooling system checked.
X Make sure that the air supply to the engine radiator is not
blocked, e.g. by frozen slush.
X If the coolant temperature is below 120 †, you can continue
driving to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. driving in
mountainous terrain and stop-start traffic. Driving systems
Problem Possible causes/consequences and
M Solutions
·
The red distance warn-
ing lamp lights up while
the vehicle is in motion.
The distance to the vehicle in front is too small for the speed
selected.
X
Increase the distance. ·
The red distance warn-
ing lamp lights up while
the vehicle is in motion.
Aw
arning tone also
sounds. You are approaching
avehicle or astationar yobstacle in your line
of travel at to ohigh aspeed.
X Be prepared to brak eimmediately.
X Pay careful attentio ntothetraffic situation. You may have to
brak eort akee vasive action.
Further informatio nonDISTRONICPLUS(Ypage 170).
Further informatio nonPRE-SAFE ®
Brake (Y page 68). Warning and indicator lamps in th
einstrumen tcluster
269On-boar dcomputer and displays Z

ensures that ther
eissufficien tpower to
start the engine.
Socket under the armrest X
Open the stowage space under the armrest
(Y page 274).
X Lift up the cover of socket :.
Socket in the front centre console All vehicles (except AMG)
X
To open: slide cover :forwards until it
engages.
X Lift up the cover of socket ;.
X To close: briefly press cover :at the
front.
The cover moves back. AMG vehicles
X
To open: briefly press the trim on
cover :.
The stowage compartment opens.
X Lift up the cover of socket ;.
X To close: fold down cover :.
Socket in the rear-compartment centre
console X
Slide cover ;forwards.
X Lift up the cover of socket :. Mobile phone
Important safety notes G
WARNING
Observe the legal requirements of the country
in which you are currently driving regarding
operating mobile communications equipment
in av ehicle. 284
FeaturesStowing and features

Useful information
............................296
Engine compartment ........................296
Service ............................................... 300
Care .................................................... 301 295Maintenance and care

Useful information
i This Owner's Manual describes all mod-
els, series and optional equipment for your
vehicle that were available at the time of
going to press. National variation sare pos-
sible. Not ethat your vehicle may not be
equipped with all of the function sdescri-
bed. This is also the case for system sand
function srelevan ttosafety.
i Read the information on qualified special-
ist workshops: (Y page 23). Engine compartment
Bonnet
Opening the bonnet G
WARNING
Do not pull the release lever while the vehicle
is in motion. If you do so, the bonnet may open
up and block your view. G
WARNING
There is arisk of injury if the bonnet is open,
even if the engin eisnot running.
Some engin ecomponents can become very
hot.
To avoid the risk of burns, only touc hthose
components described in the Owner's Manual
and observ ethe relevan tsafet ynotes. G
WARNING
The radiator fan between th eradiator and the
engine can start automatically, even if th ekey
has been remove dfromt heignitio nlock. For
this reason, you must not reach into the fan
rotation area. You could otherwise be injured. Vehicles with
apetrol engine: The elec-
tronic ignitio nsystem uses high voltage. For
this reason ,you mus tnever touch ignition
system components( ignition coil, ignition
cables, spark plug connectors or test socket)
while:
R the engine is running
R the engine is being started
R the ignition is switched on and the engine
is being cranked by hand
You could otherwise suffer an electric shock
and be seriously or even fatally injured.
Vehicles with adiesel engine: The elec-
tronic injection control uses high voltage. For
this reason ,you must never touc hinjection
system components while:
R the engin eisrunning
R the engin eisbeing started
R the ignition is switched on
You could otherwise suffer an electric shock
and be seriously or even fatally injured. G
WARNING
The windscreen wipers and wiper linkage
could be set in motion.
When the bonnet is open, you or others could
be injured by the wiper linkage.
Make sure that the windscreen wipers are
switched off. Remove the key or make sure
that no ignition position has been selected
with KEYLESS-GO. All indicator lamps must be
off in the instrumen tpanel.
! Make sure that the windscreen wipers are
not folded away from the windscreen .Oth-
erwise, yo ucould damage the windscreen
wipers or the bonnet. 296
Engine compartmentMaintenance and care

X
Make sure that the windscreen wipers are
switched off.
X Pull release lever :on the bonnet.
The bonnet is released. X
Reach into the gap, pull bonnet catch han-
dle ;up and lift the bonnet.
If you lift the bonnet by approximately
40 cm, the bonnet is opened and held open
automatically by the gas-filled strut.
Closing the bonnet G
WARNING
Make sure that nobody can become trapped
as you close the bonnet.
X Lower the bonnet and let it fall from a
height of approximately 20 cm.
X Check that the bonnet has engaged prop-
erly.
If the bonnet can be raised slightly, it is not
properly engaged. Open it again and close
it with alittle more force. Radiator
Vehicles with adiesel engine: do not cover
the radiator .Donot use thermal mats, insect
protection covers or anything similar. Doing
so can cause the Onboard Diagnostics Sys-
tem to display inaccurate values. Some of
these values are legally required and must
always be correct. Engine oil
General notes Dependin
gonyour driving style, the vehicle
consumes up to 0.8 lofoil per 1,000 km. The
oil consumption may be higher than this when
the vehicle is new or if you frequently drive at
high engine speeds.
Dependin gonthe engine, the oil dipstick may
be installed at adifferent location.
When checking the oil level:
R park the vehicle on alevel surface.
R the engine should be switched off for
approximately five minutes if the engine is
at normal operating temperature.
R if the engine is not at normal operating
temperature, e.g. if the engine was only
started briefly: wait about 30 minutes
before carrying out the measurement. Engine compartment
297Maintenance and care Z

Checking th
eoil level usin gthe oil dip-
stick Example
:vehicles with apetrol engine Example: vehicles with
adiesel engine
X Pull oil dipstick :out of the oil dipstick
tube.
X Wipe off oil dipstick :.
X Slowly slide oil dipstick :into the guide
tube to the stop, and take it out again.
If the level is between MIN mark =and
MAX mark ;,the oil level is correct.
X If the oil level has dropped to MIN mark
= or below, add 1.0 litre of engine oil.
Adding engine oil G
WARNING
If engine oil comes into contact with hot
engine parts, it may ignite and you could burn
yourself. Do not spill any engine oil on hot
engine parts. H
Environmental note
When topping up the oil, take care not to spill
any. If oil enters the soil or waterways, it is
harmful to the environment.
! Only use engine oils and oil filters that
have been approved for vehicles with a
service system. You can obtain alist of the
engine oils and oil filters tested and
approved in accordance with the
Mercedes-Benz Specification sfor Service
Product satany Mercedes-Benz Service
Centre.
Damage to the engine or exhaust system is
caused by the following:
R using engine oils and oil filters that have
not been specifically approved for the
service system
R changin gthe engine oil and oil filter after
missing the change interval required by
the service system
R using engine oil additives
! Do not add too much oil. Topping up with
too much engine oil can result in damage
to the engine or to the catalytic converter.
Have exces sengine oil siphoned off. Example: engine oil filler cap
X
Turn cap :anti-clockwise and remove it.
X Top up the engine oil.
If the oil level is at or below the MIN mark
on the oil dipstick ,add 1.0 litre of engine
oil. 298
Engine compartmentMaintenance and care

X
Replac ecap : on th efiller neck and turn
clockwise.
Mak esuret hatthe cap locks securel yinto
place.
X Chec kthe oil level again with the oil dip-
stick (Y page 298).
For further information on engine oil, see
(Y page 363). Other service products
Checking the coolant level G
WARNING
The cooling system is pressurised. Therefore,
only unscrew the cap once the engine has
cooled down. The coolant temperature gauge
must display less than 70 †.Otherwise, you
could be scalded if hot coolant escapes. X
Park the vehicl eonalevel surface.
Onl ycheck the coolant level if the vehicle
is on alevel surface and the engine has
coole ddown.
X Turn the key to position 2in the ignition
lock (Y page 141).
On vehicles with KEYLESS-GO, press the
Start/Stop button twice (Y page 141).
X Check the coolant temperatur edisplay in
the instrument cluster.
Th ec oolant temperatur emustbeb elow
70 †.
X Turn the key to position 0(Y page 141) in
the ignition lock. X
Slowl yturnc ap : half aturna nti-clock-
wise to allow exces spressure to escape.
X Turn cap :further anti-clockwis eand
remove it.
If th ecoolan tisatt heleve lofm arkerbar
= in th efille rneck when cold, ther eis
enough coolant in coolant expansion
tank ;.
If the coolant level is approximately
1.5 cm above marker bar =in the filler
neckw hen warm, there is enough coolant
in coolant expansion tank ;.
X If necessary, top up with 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 365).
Topping up the windscreen washer sys-
tem/headlam pcleaning system G
WARNING
Windscreen washer fluid/antifreez eishighly
flammable. Avoid spilling windscreen washer
fluid/antifreez eonhot engin ecomponent sas
it can ignit eand burn. Severe burns could be
the result. X
To open: pull cap:upwards by the tab.
X Top up with the premixed washer fluid.
X To close: press cap :ontothe filler neck
until it engages. Engine compartment
299Maintenance and care Z

The washer fluid reservoir is used for both the
windscreen washer system and the headlamp
cleaning system.
Further information on windscreen washer
fluid/antifreeze (Y page 366).Service
ASSYST PLUS
Service messages The ASSYST PLUS service interval display
inform syou of the next service due date.
Information on the type of service and service
intervals (see separate Servic eBooklet).
You can obtain further information from a
Mercedes-Benz Servic eCentre.
i The ASSYST PLUS service interval display
does not show any information on the
engine oil level. Observe the notes on the
engine oil level (Y page 297).
The multifunction display shows aservice
message for afew seconds, e.g.:
Next service Ain..days Service
Adue Service
Aoverdue by ... days The letter indicates which service is due.
Astands for
aminor service and B for
am ajor
service. Anumber or another letter may be
displayed after the letter .This figure indicates
any necessary additional maintenancew ork
to be performed.
If you notify aqualified specialist workshop of
this display, you will receive astatementon
the associated costs.
Th eA SSYS TPLUSs ervice interval display
does not take intoa ccountany periods of
time during which the battery is disconnec-
ted. Maintaining the time-dependent service
schedule:
X Note down the servic eduedate displayed
in the multifunctio ndisplay befor ediscon-
nectin gthe battery.
or
X After reconnecting the battery, subtract
the battery disconnection periods fro mthe
service date shown on the display.
Hiding aservice message X
Pres sthe % ora button on th esteer-
ing wheel.
Displaying service messages X
Switch th eignitio non.
X Press the =or; button on the steer-
ing whee ltoselect the Serv. menu.
X Press the 9or: button to select the
ASSYST PLUS submenu and confirm with
a.
The servic eduedate appear sinthe multi-
functio ndisplay.
Information about Service Resetting th
eASSYST PLUS service inter-
val display
! If the ASSYS TPLUS service interval dis-
play has been inadvertently reset ,this set-
tin gc an be corrected at aqualified special-
ist workshop.
Have service work carried out as described
in the Servic eBooklet. This may otherwise
lead to increased wear and damage to the
major assemblies or the vehicle.
Aq ualified specialist workshop, e.g. a
Mercedes-Ben zService Centre, will reset the
ASSYST PLUS servic einterval display after
the servic ework has been carried out. You
can also obtain further information on main-
tenance work, for example. 300
ServiceMaintenance and care

Special service requirements
Arduous operating condition
sorincreased
loads on the vehicle will require some service
work to be performed more often than for a
vehicle in normal use. Such arduousc ondi-
tions include regular city driving with frequent
intermediate stops and use in mountainous
terrain or on poor road surfaces.
For example, if the vehicle is used under ardu-
ous operating conditions, have air filters,
engine oil and oil filters changed frequently
and check the wheels often.F urther informa-
tion can be obtaine dataqualified specialist
workshop, e.g. aMercedes-Ben zService
Centre.
Driving abroad
An extensive Mercedes-BenzS ervice network
is also available in other countries. The
Service Hotline's curren ttelephone numbers
for use when you are abroad are to be found
in the "Mercedes-Benz Service24h" section
of the Service Booklet. Care
General notes
H
Environmental note
Dispose of empty packagin gand cleaning
cloth sinane nvironmentally responsible man-
ner.
! For cleanin gyour vehicle, do not use any
of the following:
R dry, rough or hard cloths
R abrasive cleanin gagents
R solvents
R cleanin gagents containin gsolvents
Do not scrub.
Do not touch the surfaces or protective
films with hard objects, e.g. aring or ice
scraper. You could otherwise scratch or
damage the surfaces and protective film. !
Do not park up the vehicle for an extended
period straight after cleanin git, particularly
after having cleaned the wheels with wheel
cleaner. Wheel cleaners could cause
increased corrosion of the brake discs and
brake pads/linings. For this reason, you
should drive for afew minutes after clean-
ing. Braking heats the brake discs and the
brake pads/linings, thus drying them. The
vehicle can then be parked up.
Regular care of your vehicle is acondition for
retaining the quality in the long term.
Use care product sand cleanin gagents rec-
ommended and approved by Mercedes-Benz. Washing the vehicle and cleaning the
paintwork
Automatic car wash G
WARNING
Braking efficiency is reduced after washing
the vehicle. This could cause an accident. For
this reason, following acar wash, drive with
particular care until the brakes are dry. G
WARNING
The vehicle is braked when the HOLD function
or DISTRONIC PLUS is activated. Therefore,
deactivat ethe HOLD function and DISTRONIC
PLUS before the vehicle is washed in an auto-
matic car wash.
! Make sure that:
R the side windows and sliding sunroof are
closed completely.
R the blower for the ventilation/heating is
switched off (OFF button is depressed).
R the windscreen wiper switch is at posi-
tion 0.
The vehicle could otherwise be damaged.
! In car washes with atowing mechanism,
make sure that the automatic transmission
is in transmission position N,otherwise the
vehicle could be damaged. Care
301Maintenance and care Z