engine overheat MERCEDES-BENZ C-Class COUPE 2017 CL205 Owner's Manual

GWARNING
If you switch off the ignitio nwhile driving,
safety-relevant functions are only available
with limitations, or not at all .This coul daffect,
for example, the power steering and the brake
boosting effect. You wil lrequire considerably
more effort to steer and brake. There is arisk
of an accident.
Do not switch off the ignitio nwhile driving.
GWARNING
If the parking brake has not been fully
released when driving, the parking brake can:
Roverheat and caus eafire
Rlose its hold function.
There is arisk of fire and an accident. Release
the parking brake full ybefore driving off.
!Do not war mupthe engine with the vehicle
stationary. Drive off immediately. Avoid high
engine speeds and driving at full throttle until
the engine has reache dits operating temper-
ature.
Only shift the automatic transmission to the
desired drive position when the vehicleiss ta-
tionary.
Where possible,a voids pinning the drive
wheels when pulling awa yonslippery roads.
You coul dotherwise damage the drive train.
!Mercedes-AMG vehicles: at low engine oil
temperatures below 68 ‡(+20 †), the max-
imum engine speedisr estricted in order to
protect the engine. To protect the engine and
maintai nsmooth engine operation, avoi ddriv-
ing at full throttle when the engine is cold.
SmartKey positions
SmartKey
gTo remove the SmartKey
1Powe rsupply for some consumers ,such as
the windshiel dwipers
2Ignition (power supply for all consumers)
and drive position
3To start the engine
iThe SmartKey can be turned in the ignition
lock even if it is not the correct SmartKey for
the vehicle. The ignitio nisnot switched on.
The engine cannot be started.
Start/Stop button
General notes
When you insert the Start/Stop button into the
ignitio nlock, the system needs approximately
two seconds recognitio ntime. You can then use
the Start/Stop button.
Pressing the Start/Stop button severalt imes in
succession corresponds to the different key
positions in the ignitio nlock. This is only the
case if you are not depressing the brake pedal.
If you depress the brake pedala nd press the
Start/Stop button, the engine starts immedi-
ately.
Ac heck which periodically establishe saradio
connection between the vehiclea nd the Smart-
Key determines whethe ravalidS martKey is in
the vehicle. This occurs, for example, when
starting the engine.
Driving131
Driving and parking
Z

The ECO display consistsofthree sections, with
an inner and outer area. The section scorre-
spond to the following three categories:
:Acceleration (evaluation of all accel-
eration processes):
Rthe outer area fills up and the inner area lights up green: moderate
acceleration ,especially at higher
speeds
Rthe outer area empties and the
inner area is gray: sporty acceler-
ation
;Coasting (evaluation of all decelera-
tion processes):
Rthe outer area fills up and the inner area lights up green: anticipatory
driving, keeping your distance and
early release of the accelerator.
The vehicle can coast without use
of the brakes.
Rthe outer area empties and the
inner area is gray: frequent heavy
braking
=Constant (continuous evaluation
over the entir ejourney):
Rthe outer area fills up and the inner
area lights up green: constant
speed and avoidance of unneces-
sary acceleration and deceleration
Rthe outer area empties and the
inner area is gray: fluctuations in
speed
The three inner areas display the current driving
style and light up green as aresult of aparticu-
larly economical driving style. Dependin gonthe
driving situation, up to two areas may light up
simultaneously.
At the beginning of the journey, the three outer
areas are empty and fill up as aresult of eco-
nomical driving. Ahigher level indicates amore
economical driving style. If the three outer areas
are completely filled at the same time, the driver
has adopted the most economical driving style
for the selected settings and prevailing condi-
tions. The ECO display border lights up.
The ECO display does not indicate the actual fuel consumption. The additionally achieved range
displayed under Bonus fr. Start
does not
indicate afixed consumption reduction. In addition to driving style, the actual consump-
tion is affected by other factors, such as:
Rload
Rtire pressure
Rcold start
Rchoice of route
Relectrical consumer
sswitched on
These factor sare not included in the ECO dis-
play.
An economical driving style specially requires
driving at moderate engine speeds.
Achievingah igher value in the categories
"Acceleration" and "Constant":
Robserve the gearshift recommendations.
Rdrive in drive program E.
On long journeys at aconstant speed, e.g. on the
highway, only the outer area for "constant" will
change.
The ECO display summarizes the driving style
from the start of the journey to its completion.
Therefore, there are more marked changes in
the outer areas at the start of ajourney. On lon-
ger journeys, there are fewer changes. For more
marked changes, perform amanual rest
(
Ypage 206).
For further information on the ECO display,s ee
(
Ypage 205).
Braking
Important safety notes
GWARNING
If you shift down on aslippery road surface in
an attempt to increase the engine's braking
effect,t he drive wheels could lose their grip.
There is an increased danger of skidding and
accidents.
Do not shift down for additional engine brak-
ing on aslippery road surface.
Downhill gradients
!On long and steep gradients, you must
reduce the load on the brakes by shiftin gtoa
lower gear in good time. This allows you to
take advantage of the engine's braking effect.
This helps you to avoid overheating the
brakes and wearing them out excessively.
Driving tips157
Driving and parking
Z

When you take advantage of engine braking, a
drive wheel may not turn for some time, e.g.
on aslippery road surface. This could cause
damage to the drive train. This type of damage is not covered by the Mercedes-Benz war-
ranty.
Heavy and light loads
GWARNING
If you rest your foot on the brake pedal while
driving, the braking system can overheat. This increases the stoppin gdistanc eand can even
cause the braking system to fail. There is a
risk of an accident.
Never use the brake pedal as afootrest. Never
depress the brake pedal and the accelerator
pedal at the same time.
!Depressin gthe brake pedal constantly
results in excessive and premature wear to
the brake pads.
If the brakes have been subjected to aheavy
load, do not stop the vehicle immediately. Drive
on for ashort while. This allows the airflow to
cool the brakes more quickly.
Wet roads
If you have driven for along time in heavy rain
without braking, there may be adelayed reac-
tion from the brakes when braking for the first
time. This may also occur after the vehicle has
been washed or driven through deep water.
You have to depress the brake pedal more
firmly. Maintain agreater distanc efrom the
vehicle in front.
After driving on awet road or having the vehicle
washed, brake firmly while paying attention to
the traffic conditions. This will warm up the
brake discs, thereby drying them more quickly
and protecting them against corrosion.
Limited braking performance on salt-
treated roads
If you drive on salted roads, alayer of salt resi-
due may form on the brake discs and brake
pads. This can result in asignificantly longer
braking distance.
RIn order to prevent any salt build-up, apply the
brakes occasionally while paying attention to
the traffic conditions.
RCarefully depress the brake pedal and the
beginnin gand end of ajourney.
RMaintain agreater distanc etothe vehicle
ahead.
Servicing the brakes
!The brake fluid level may be too low, if:
Rif the red brake warning lamp lights up in
the instrument cluster and
Ryou hear awarning ton ewhile the engine is
running
Observe additional warning messages in the
multifunction display.
The brake fluid level may be too low due to
brake pad wear or leaking brake lines.
Have the brake system checked immediately. Consult aqualified specialist workshop to
arrange this.
!Vehicles with 4MATIC: function or per-
formance test smay only be carried out on a2-
axle dynamometer. If you wish to operate the
vehicle on such adynamometer, please con-
sult aqualified specialist workshop in
advance. You could otherwise damage the
drive train or the brake system.
!Vehicles with 4MATIC: the ESP®system
operates automatically. The engine and the
ignition must therefore be switched off (the
SmartKey must be in position 0or 1in the
ignition lock or the Start/Stop button must be
in position 0or 1)ift he electric parking brake
is tested on abrake dynamometer.
Brakin gtriggered automatically by ESP
®may
cause severe damage to the brake system.
All checksa nd maintenance work on the brake
system must be carried out at aqualified spe-
cialist workshop.
Have brake pads installed and brake fluid
replaced at aqualified specialist workshop.
If the brake system has only been subject to
moderate loads, you should test the functional-
ity of your brakes at regular intervals.
Information on BAS (Brake Assist )(
Ypage 62)
and BAS PLUS (Brake Assist PLUS) (Ypage 62).
158Driving tips
Driving and parking

Winter driving
GWARNING
If you shift downonaslipperyr oad surface in
an attempt to increas ethe engine' sbraking
effect, the drive wheels coul dlose their grip.
There is an increased dange rofskidding and
accidents.
Do not shift downf or additionalengine brak-
ing on aslipperyr oad surface.
GDANGER
If the exhaust pip eisblocked or adequate
ventilation is not possible ,poisonousg ases
such as carbo nmonoxide (CO )may enter the
vehicle. This is the case, e.g. if the vehicle
becomest rappedinsnow. There is arisk of
fatal injury.
If you leave the engine or the auxiliary heating
running, make sure the exhaust pip eand area
around the vehicl eare clearofs now. To
ensure an adequate supply of fresh air, open a
window on the side of the vehicl ethat is not
facing into the wind.
Have you rvehicl ewinter-proofed at aqualified
specialist worksho patthe onset of winter.
Drive particularly carefully on slipperyr oad sur-
faces. Avoid sudden acceleration, steering and
braking maneuvers. Do not use the cruis econ-
trol or DISTRONIC PLUS.
If the vehicl ethreatens to skid or cannot be
stoppedw hen moving at low speed:
XShift the transmission to position N.
The outside temperature indicator is not
designed to serve as an ice-warning device and
is therefore unsuitable for that purpose.
Changes in the outside temperature are dis-
played after ashort delay.
Indicated temperatures just above the freezing
point do not guarantee that the road surface is
free of ice. The road may still be icy, especially in
wooded area soronbridges. The vehicl ecould
skid if you fail to adapt you rdriving style .Always
adapt you rdriving style and drive at aspeedt o
sui tthe prevailing weather conditions.
You should pay special attention to road condi-
tions when temperatures are around freezing
point. For more information on driving with snow
chains, see (
Ypag
e319).
For more information on driving with summer
tires, see (
Ypag e318).
Observe the notes i
n the "Winter operation" sec-
tion (Ypag e318).
Driving systems
Mercedes-Ben zIntelligen tDrive
Mercedes-Benz Intelligent Drive stands for inno-
vative drive rassistance and safety systems
which enhance comfort and support the drive rin
critical situations. With these intelligent co-ordi-
nated systems Mercedes-Benz has set amile-
stone on the path towards autonomous driving.
Mercedes-Benz Intelligent Drive embraces all
elements of active and passive safety in one well
though tout syste m–for the safety of the vehi-
cle occupants and that of other road users.
Further information on driving safety systems
(
Ypag e61).
Cruise control
General notes
Cruise control maintains aconstant road speed
for you .Itbrakes automatically in order to avoid
exceeding the set speed. Change into alower
gearing ood time on long and steep downhill
gradients. This is especially important if the
vehicl eisladen. By doing so, you wil lmake use
of the braking effect of the engine. This relieves
the loa donthe brake syste mand prevents the
brakes from overheating and wearing too
quickly.
Use cruis econtrol only if road and traffic con-
ditions make it appropriate to maintain asteady
speedf orap rolonged period. You can store any
road speeda bove 20 mph (30 km/h).
Important safety notes
If you fail to adapt you rdriving style ,cruis econ-
trol can neither reduce the risk of an accident
nor override the law sofphysics. Cruise control
cannot take into account the road ,traffic and
weather conditions. Cruise control is only an
aid .You are responsiblef or the distance to the
160Driving systems
Driving and parking

Tachometer
!
Do not drive in the overrevving range ,asthis
could damage the engine.
The red band in the tachometer indicates the
engine's overrevving range.
The fuel supply is interrupte dtoprotect the
engine when the red band is reached.
Outside temperature display
Yo us houl dpayspecial attentio ntoroadc ondi-
tions when temperatures ar earound freezing
point.
Bea rinm indt hatt he outside temperatur edis-
play indicates the temperatur emeasured and
does not record the roa dtemperature.
The outside temperatur edisplay is in the multi-
functio ndisplay (
Ypage 202).
Changes in the outside temperatur earedis-
played after ashort delay.
Coolant temperature display
GWARNING
Opening the hoo dwhent he engine is over-
heate dorw hent here is afireint he engine
compartment could expose yo utohot gases
or othe rservic eproducts. There is arisko f
injury.
Let an overheate dengine coo ldow nb efore
opening the hood. If there is afireint he
engine compartment, kee pthe hoo dclosed
and contact the fir edepart ment.
!Adisplay message is shown if the coolant
temperatur eistoo high.
If the coolant temperatur eisover2 48 ‡
(12 0† ),do not continue driving. The engine
will otherwis ebedamaged .
The coolant temperatur edisplay is in the lower
sectio nofthe tachometer (
Ypage 34).
Under normal operating conditions and with the
specifie dcoolant level ,the coolant temperature
mayr iseto2 48‡(120† ).
Operatin gthe on-board computer
:Multifunctio ndisplay
;Right contro lpan el
=Lef tcontro lpan el
XTo activate the on-board computer: turn
the SmartKeytop osition1in the ignition lock.
Yo uc an contro lthe multifunctio ndisplay and
the settings in the on-board compute rusing the
buttons on the multifunctio nsteerin gwheel .
Left contro lpanel
òROpens the menu list
9
:Press briefly:
RScrolls in lists
RSelects amenu or function
RIn the RadioorMediamenu:
opens the track or statio nlista nd
selects astation, an audi otrack or
av ideo scene
RIn the Telephonemenu:switches
to the phone book and selects a
nam eorat elephon enumber
9
:Press and hold:
RScrolls quickl ythroug halllists
RIn the RadioorMediamenu:
selects astation, audi otrack or
video scene using rapi dscrolling
RIn the Telephonemenu:starts
rapi dscrolling if the phone book is
open
Displays an doperation201
On-boa rd computera nd displays
Z

Display messagesPossible causes/consequences andMSolutions
?
CoolantToo HotStopVehicl eTurnEngine Off
The coolan tistoohot .
Aw arning tone also sounds.
GWARNIN G
Do no tdrive when your engin eisoverheated. This can caus esom e
fluids whic hmay hav eleaked int othe engin ecom partmen ttocatch
fire.
Steam from th eoverheate denginec an also caus eserious burn swhich
can occur jus tbyopening th ehood.
There is ariskofi njury.
XPull ove rand stop th evehicl esafely and switch off th eengine, pay-
ing attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 152).
XWait until th eengineh as cooled down .
XMakesuret hatthe air supply to th eenginer adiato risnotblocked,
e.g. by snow, slus horice.
XDo no tstart th eenginea gain until th edisplay message goe sout and
th ec oolan ttem perature is belo w248‡(120† ). Otherwise ,the
engin ecould be damaged.
XPay attention to th ecoolan ttem perature display.
If th etemperatur eincreases again:
XVisit aqualified specialist workshop immediately.
Under normal operating condition sand wit hthe specified coolan t
level, th ecoolan ttem perature may ris eto2 48 ‡(120† ).
#
See Operator' sMan‐ual
The battery is no tbein gcharged.
Aw arning tone also sounds.
Possibl ecauses are:
Rad efective alternato r
Ratornp oly-V-belt
Ram alfunction in th eelectronics
!Do no tcontinue driving. The engin ecould otherwise overheat.
XPull ove rand stop th evehicl esafely and switch off th eengine, pay-
ing attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 152).
XConsult aqualified specialist workshop .
Display messages233
On-boardc omputer andd isplays
Z

Warning/
indicator
lampNSignal type
Possiblec auses/consequences and M
Solutions
?NThe red coolant warning lamp comes on while the engine is running.
The coolant leve listoo low.
If the coolant leve liscorrect, the airflow to the engine radiator may be blocked or
the electric engine radiator fan may be malfunctioning.
The coolant is too hot and the engine is no longer being cooleds ufficiently.
XObserve the additionaldisplay messages in the multifunction display.
XPul lover and stop the vehicles afelyand switch off the engine, paying attention
to road and traffic conditions.
XSecure the vehiclea gainst rolling away(Ypage152).
XLeave the vehiclea nd keepasafe distance from the vehicleu ntil the engine has
cooledd own.
XCheck the coolant leve land add coolant, observing the warning notes
(Ypag e290).
XIf you have to add coolant frequently, have the engine cooling system checked.
XMake sure that the air supply to the engine radiator is not blocked ,e.g. by snow,
slush or ice.
XDo not start the engine again until the coolant temperature is below 248 ‡
(120 †). Otherwise, the engine coul dbedamaged.
XDrive to the neares tqualified specialist workshop.
XAvoid heavy loads on the engine as you do so, e.g. driving in mountainous terrain
and stop-and-go traffic.
?NThe red coolant warning lamp comes on while the engine is running. Awarning
tone als osounds.
The coolant temperature has exceeded2 48‡(120 †). The airflow to the engine
radiator may be blocked or the coolant leve lmay be too low.
GWARNING
The engine is not being cooleds ufficiently and may be damaged.
Do not drive whe nyoure ngine is overheated. This can cause some fluids which
may have leaked into the engine compartment to catch fire.
Steam from the overheated engine can also cause serious burns which can occur
just by opening the hood.
There is arisk of injury.
XObserve the additiona ldisplaym essages in the multifunction display.
XPullover and stop the vehicle safely and switch off the engine, paying attention
to road and traffic conditions.
XSecure the vehicle against rolling away (Ypag e152).
XLeav ethe vehicle and keep asafe distance from the vehicle until the engine has
coole ddown.
XCheck the coolant leve land add coolant, observing the warning notes
(Ypag e290).
XIf you have to add coolant frequently, have the engine cooling system checked.
XMake sure that the ai rsupply to the engine radiator is not blocked, e.g. by snow,
slush or ice.
254Warning and indicator lamps in the instrument cluster
On-board computer and displays

Engine compartment
Hood
Important safety notes
GWARNING
If th ehood is unlatched, it may open up when
th ev ehicle is in motion and blocky our view.
Thereisar isk of an accident.
Never unlatch th ehood while driving .Before
ever ytrip, ensure that th ehood is locked.
GWARNING
When opening and closingt hehood,itm ay
suddenly fall int othe closed position.T hereis
ar isk of injury to personsw ithin range of
movementoft hehood.
Open and close th ehood only when no onei s
within its range of movement.
GWARNING
Opening th ehood when th eengine is over-
heated or when there is afireint heengine
compartmen tcoul de xpose you to hot gases
or other servic eproducts. Thereisar isk of
injury.
Let an overheate dengine coo ldown before
opening th ehood.Ift here is afireint he
engine compartment, keep th ehood closed
and contac tthe fired epartment.
GWARNING
The engine compartmen tcontain smoving
components. Certain components, sucha s
th er adiator fan ,may continue to run or start
again suddenly when th eignition is off .There
is ar isk of injury.
If you nee dtodoany work inside th eengine
compartment:
Rswitch off th eignition
Rnever reac hintot he area wheret here is a
risk of danger from moving components,
suchast hefan rotatio narea
Rremove jewelry and watches
Rkeep items of clothing and hair, for exam-
ple, away from moving parts
GWARNING
The ignition system and th efuel injection sys-
te mw ork unde rhigh voltage. If you touch
component swhicha re unde rvoltage, you
coul dget an electric shock. Thereisar isk of
injury.
Never touch component softheignition sys-
te morf uel injection system when th eignition
is switched on.
Opening th ehood
GWARNING
Certain component sintheengine compart-
ment, suchast heengine ,radiator and parts
of th eexhaust system, can become ver yhot.
Workin gintheengine compartmen tposesa
risk of injury.
Wherep ossible, let th eengine coo ldown and
touch only th ecomponent sdescribe dinthe
following.
GWARNING
When th ehood is open and th ewindshield
wipersa re set in motion,y ou can be injured by
th ew iper linkage. Thereisar isk of injury.
Always switch off th ewindshield wipersa nd
th ei gnition before opening th ehood.
!Makes ure that th ewindshield wipersa re
no tfolded away from th ewindshield. You
coul dotherwise damag ethe windshield wip-
ers or th ehood.
Engine compartment287
Maintenance and care
Z

Filling capacities
The followingvalue srefer to an oil chang e
includin gthe oil filter.
Missing value swere no tavailable at time of
goin gtop rint.
ModelCapacit y
Mercedes ‑AMG
vehicles
C3 007.4USq t(7.0 l)
C300 4MATIC6.9 US qt (6.5 l)
Additives
!Do not us eany additive sinthe engine oil.
Thi scould damag ethe engine.
Brake fluid
GWARNING
The brake fluid constantly absorb smoisture
from the air. Thi slowers the boiling point of
the brake fluid .Ifthe boiling point of the brake
fluid is too low, vapor pockets may form in the
brake system when the brakes are applied
hard. Thi swould impai rbraking efficiency.
There is ariskofana ccident.
Yo us houl dhavet he brake fluid renewe dat
the specified intervals.
Whe nhandling brake fluid ,observe the impor-
tant safety notes on service products
(
Ypage 344).
The brake fluid change interval scan be found in
the Maintenance Booklet.
Only us ebrake fluid approved by Mercedes-
Benz in accordance with MB-Freigab eorMB-
Approva l331.0.
Information abouta pproved brake fluid can be
obtaine datany qualified specialist workshopo r
on the Interne tat
http://bevo.mercedes-benz.co m.
iHave the brake fluid regularly replaced at a
qualified specialist workshop in accordance
with the replacement intervals and the
replacement confirmed in the Maintenance
Booklet.
Coolant
Importan tsafety notes
GWARNING
If antifreeze comes into contact with hot com- ponents in the engine compartment, it may
ignite. There is arisk of fire and injury.
Let the engine cool dow nbefore yo uadd anti-
freeze .Make sur ethat antifreeze is not spilled
next to the filler neck. Thoroughly clea nthe
antifreeze from components before starting
the engine.
!Only ad dcoolant that has bee npremixed
with the desire dantifreeze protection. You
coul dotherwise damag ethe engine.
Furthe rinformatio noncoolants can be found
in the Mercedes-Benz Specifications for Ser-
vice Products, MB BeVo 310.1, e.g. on the
Internet at http://bevo.mercedes-benz.com.
Or contact aqualifie dspecialist workshop.
!Always use asuitabl ecoolant mixture, even
in countries where hig htemperatures prevail.
Otherwise ,the engine cooling system is not
sufficiently protected from corrosion and
overheating.
iHave the coolant regularly replaced at a
qualified specialist workshop and the replace-
ment confirmed in the Maintenance Booklet.
Comply with the important safety notes for ser-
vice products whe nhandling coolant
(
Ypage 344).
The coolant is amixture of water and anti-
freeze/corrosion inhibitor. It performs the fol-
lowing tasks:
RAnti-corrosion protection
RAntifreeze protection
RRaising the boiling point
If the coolant has antifreeze protection dow nto
-35 ‡(-37† ), the boiling point of the coolant
during operation is approximatel y266 ‡
(130 †).
Service products and filling capacities347
Technical data
Z