engine overheat MERCEDES-BENZ CLA COUPE 2018 Owner's Manual

Notesonb reaking-in anew vehicle
Important safety notes
Thes ensors ystemofs omedriving and driving
safety systems adjusts automaticall ywhile a
certai ndistance is being driven after the vehicle
ha sb eend elivere dorafter repairs. Full system
effectiveness is not reachedu ntilthe end of this
teach-inp rocedure.
New and replaced brake pads and discs only
reach their optimum braking effect after several hundred kilometers of driving. Compensate for
thi sb yapplyin ggreate rforce to the brake pedal.
The first 1000 miles (150 0km)
Them orey ou look after the engine when it is
new ,the mor esatisfied yo uwillbew ithi ts per-
formance in the future.
RYo us houl dtherefore drive at varying vehicle
and engine speeds for the first 1000 miles
(1500 km).
RAvoi dheavy loads, e.g .driving at full throttle,
during thi speriod.
RChang egearing oodt ime, befor ethe tach-
ometer needl eisÔ of the wa ytothe red area
of the tachometer.
RDo not manuall yshift to alower gear to brake
the vehicle.
RTry to avoi ddepressing the accelerator pedal
beyond the point of resistanc e(kickdown).
RIdeally ,for the first 1000 mile s(1500 km),
driv einp rogram E.
Addition al breaking-in note sfor Mercedes-AMG
vehicles:
RDo no tdrivef aster than 85 mph (14 0km/ h)
for th efirst 1,000 miles (1,500 km).
ROnly allow th eengine to reac hamaximum
engine speedof4 ,500 rpm briefly.
RChange gear in good time.
Afte r1,000 miles (1,500 km), you can increase
th ee ngine speedg radually and brin gthe vehicle
to full speed.
You shoulda lso observethese note sonbreak-
ing-in if th eengine or part softhedriv etrain on
your vehicle have been replaced.
Always observ ethe maximum permissible
speed.
Driving
Important safety notes
GWARNING
Object sinthedriver'sf ootwell can restrict the
pedal travel or obstruc tadepressedp edal.
The operatin gand road safety of th evehicle is
jeopardized. Thereisar isk of an accident.
Makes ure that all object sinthevehicle are
stowed correctly, and that they canno tenter
th ed river'sf ootwell. Install th efloormats
securely and as specified in orde rtoensure
sufficient clearance for th epedals.Don otuse
loosef loormats and do no tplace floormats on
to pofo neanother.
GWARNING
Unsuitable footwear can hinder correc tusage
of th epedals,e .g.:
Rshoesw ith thick soles
Rshoeswith high heels
Rslippers
Thereisar isk of an accident.
Wear suitable footwear to ensure correct
usage of th epedals.
GWARNING
If you switch off th eignition while driving,
safety-relevan tfunctionsa re only available
with limitations ,ornotat all. This coul daffect,
for example, th epower steering and th ebrake
boostin geffect .You will require considerably
moree ffort to steer and brake. Thereisar isk
of an accident.
Do no tswitch off th eignition while driving.
GWARNING
If th eparking brak ehas no tbeen fully
released when driving ,the parking brak ecan:
Roverheat and caus eafire
Rlose its hold function.
Thereisar isk of fireand an accident. Release
th ep arking brak efully before driving off.
Driving121
Driving and parking
Z

Holding the vehicle stationary on uphill
gradients
GWARNING
If the clutch overheats, the electronic man-
agement system is automatically deactivated. This interrupts the power transmission. The
vehiclem ay,for example, roll backwards on
gradients. There is arisk of an accident.
Never hold the vehicles tationary on uphill
gradients by depressing the accelerator.
The clutch may overheat if you hold the vehicle
stationary on uphill gradients by depressing the
accelerator pedal. If the clutch overheats, a
warning tone sounds.
All vehicle s(except Mercedes-AMG vehi-
cles): theStop Vehicle Shift to 'P'
Leave Engine Runningdisplay message
appears in the multifunction display .You will
only be abl etocontinue you rjourney once the
clutch has cooledd ownand the display mes-
sage in the multifunction display has disap-
peared.
Mercedes-AMG vehicles: theTrans. Oil
Overheated Drive on with Caredisplay
message appears in the multifunction display.
Do not hold the vehicles tationary on uphill gra-
dients by depressing the accelerator pedal.
Instead, only ever hold the vehicles tationary on
uphill gradients by:
Rdepressing the brake pedal
Ractivating the HOLD function
Rengaging the electric parking brake
Kickdown
Use kickdown for maximu macceleration.
XDepress the accelerator pedalb eyond the
pressure point.
The automatic transmission shifts to alower
geard epending on the engine speed.
XEase off the accelerator pedalo nce the
desired speedisr eached.
The automatic transmission shifts back up.
Mercedes-AMG vehicles: it is only possible to
use kickdown in the automatic drive program
and the temporary manua ldrive program M.
When manua ldrive program Mis permanently
activated, kickdown is not possible. For further information on kickdown in manual
drive program
M(
Ypag e138).
Rocking the vehicle free
Shifting back and forth between transmission
positions hand kcan help to free up the
vehicleifitg ets stuck in mud or snow. The vehi-
cle's engine management system limits the
speedtoam aximumof5m ph (9 km/h) when
shifting back and forth. To shift repeatedly
between transmission positions hand k,
move the DIRECT SELECT leverupa nd down
pastt he point of resistance.
Drive programs
Al lv ehicle s(except Mercedes-AMG
vehicles)
Drive program C(Comfort)
Drive program Cis characterized by the follow-
ing:
Rthe vehicled elivers comfortable, economical
handling characteristics.
Rthe vehiclep ulls awaymore gently in forward
and reverse gears, unless the accelerator
pedalisd epressed fully.
Rthe vehicleh as improved driving stability,f or
exampl eonslippery road surfaces.
Roptimalf uel consumption resulting from the
automatic transmission shifting up sooner.
The vehicleisd riveninthe low engine speed
range and the wheels are less likelytos pin.
Drive programS(Sport)
Drive program Sis characterized by the follow-
ing:
Rsporty engine settings.
Rthe automatic transmission shifts up later.
The fuel consumption possibly being higher
as aresult of the later automatic transmission
shift points.
134Automatic transmission
Driving and parking

In addition to driving style, the actual consump-
tion is affected by other factors, such as:
RLoad
RTire pressure
RCold start
RChoice of route
RActive electrical consumers
These factors are not includedint he ECO dis-
play.
An economical driving style specially requires
driving at moderate engine speeds.
Achieving ahigher valu einthe categories
"Acceleration" and "Constant":
Robserve the gearshift recommendations.
Rdrive the vehicle in drive program Cor E
(vehicles with aDYNAMIC SELECT button).
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 areasatt he start ofajourney. On lon-
ger journeys, there are fewer changes. For more
marked changes, perform amanua lrest
(
Ypage 181).
For more information on the ECO display, see
(
Ypage 180).
Braking
Important safety notes
GWARNING
If you shift down on aslippery road surface in
an attempt to increase the engine's braking
effect, the drive wheelsc ould 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 shifting to a
lowerg ear in good time. This allows you to
take advantage of engine braking. For this you
must first activate manua lgearshifting. This helps you to avoid overheating the brakes and
wearing them out excessively.
When you take advantage of engine braking, it
is possible that
adrive wheel willn ot rotate 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 warranty.
Briefly depressing the accelerator pedalo n
downhill gradients whilet he manualdrive pro-
gram Mis temporarilya ctivated: the automatic
transmission may switch to the last active auto-
matic drive program Eor S.T he automatic trans-
missionm ay shift to ahigherg ear. This can
reduce the engine's braking effect.
Heavy and light loads
GWARNING
If you rest you rfoot on the brake pedalw hile
driving, the braking system can overheat. This increases the stopping distance and can even
cause the braking system to fail.T here is a
risk of an accident.
Never use the brake pedalasaf ootrest. Never
depresst he brake pedala nd the accelerator
pedalatt he same time.
!Depressing the brake pedalc onstantly
results in excessive and premature weart o
the brake pads.
If the brakes have been subjected to aheavy
load,don ot stop the vehicle immediately.D rive
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
withoutb raking, 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 depresst he brake pedalmore
firmly.M aintainagreater distance from the
vehicle in front.
After driving on awet road or having the vehicle
washed, brake firmly whilep aying attention to
the traffic conditions. This willw arm up the
brake discs, thereby drying them more quickly
and protecting them against corrosion.
146Driving tips
Driving and parking

If you leave the engine or the auxiliary heatingrunning, make sure the exhaust pipe and area
around the vehicle are clear of snow. To
ensure an adequate supply of fresh air, open a
window on the side of the vehicle that is not
facing into the wind.
Have you rvehicle winter-proofed at aqualified
specialist workshop at the onset of winter.
Drive particularly carefully on slippery road sur-
faces. Avoid sudden acceleration, steering and
braking maneuvers. Do not use cruise control or Distance PilotD ISTRONIC.
If the vehicle threatens to skid or cannot be
stopped when moving at low speed:
XShift the transmission to position N.
XTry to bring the vehicle under control using
corrective steering.
The outsidet emperature indicator is not
designed to serve as an ice-warning device and is therefore unsuitable for that purpose.
Changes in the outsidet emperature are dis-
played after ashort delay.
Indicated temperature sjust above the freezing
point do not guarantee that the road surface is
free of ice. The road may still be icy, especially in
woodeda reasoronb ridges.
You shoul dpay speciala ttention to road condi-
tions when temperature sare around freezing
point.
For more information on driving with snow
chains, see (
Ypage 290).
For more information on driving with summer
tires, see (
Ypage 289).
Observe the notes in the "Winter operation" sec-
tion (
Ypage 289).
Drivin gsystems
Cruise control
General notes
Cruise control maintains aconstant road speed
for you .Itbrakes automatically in order to avoid
exceeding the set speed.Onl ong and steep
downhill gradients, especially if the vehicle is
laden, you must select alow gear in good time.
You need to shift manually using the steering
wheel paddle shifters beforehand. By doing so,
you willm ake use of the braking effect of the engine. This relieves the load on the brake sys-
tem and prevents the brakes from overheating
and wearing too quickly.
When the engine is running, you can use the
cruise control lever to limitt
he speed to any
speed between20m ph (30 km/h)and the tech-
nicallyp ermitted maximum speed of the vehicle.
Use cruise control only if road and traffic con-
ditions make it appropriate to maintain asteady
speed for aprolongedp eriod.
The speed indicated in the speedometer may
differ slightly from the speed stored.
Important safety notes
If you fail to adapt you rdriving style, cruise con-
trol can neither reduce the risk of an accident
nor override the lawsofp hysics. Cruise control
cannot take into account the road, traffic and
weather conditions. Cruise control is only an
aid.Y ou are responsible for the distance to the
vehicle in front, for vehicle speed,f or braking in
good time and for staying in you rlane.
Do not use cruise control:
Rin road and traffic conditions which do not
allow you to maintain aconstant speed,e .g. in
heavy traffic or on winding roads
Ron slippery road surfaces .Braking or accel-
erating could cause the drive wheelstol ose
traction and the vehicle could then skid
Rin poor visibility, e.g. due to fog, heavy rain or
snow
If there is achange of drivers, advise the new
driver of the speed stored.
Cruise control lever
:Activates or increases speed
;Activates or reduces speed
Driving systems149
Driving and parking
Z

iWhen you switch off the engine, the last
speed stored is cleared.
Distance Pilot DISTRONIC
General notes
Distance Pilot DISTRONIC regulates the speed
and automatically helps you maintain the dis-
tanc etot he vehicle detected in front. Vehicles
are detected with the aid of the radar sensor
system. Distance Pilot DISTRONIC brakes auto-
matically to avoid exceedingt he set speed or to
maintain the designated distanc efrom the vehi-
cle in front.
If Distance Pilot DISTRONIC detect sthat there is
ar isk of acollision, you will be warned visually
and acoustically. Without your intervention, Dis-
tanc ePilot DISTRONIC cannot prevent acolli-
sion. An intermittent warning ton ewill then
sound and the distanc ewarning lamp will light
up in the instrument cluster. Brake immediately
in order to increase the distanc etothe vehicle in
frontort ake evasive action provided it is safe to
do so.
Distance Pilot DISTRONIC operates in the range
between 0mph (0 km/h) and 120 mph
(200 km/h).
Change into alower gear in good time on long
and steep downhill gradients .This is especially
importan tifthe vehicle is laden. By doing so, you
will make use of the braking effect of the engine.
This relieves the load on the brake system and
preventst he brakes from overheatin gand wear-
ing too quickly.
Do not use Distance Pilot DISTRONIC on roads
with steep gradients.
For Distance Pilot DISTRONIC to assist you
when driving, the radar sensor system must be
operational.
Sinc eDistance Pilot DISTRONIC transmits radar
waves, it can resemble the radar detectors of
the responsible authorities. You can refer to the
relevant chapter in the Operator' sManual if
questions are asked about this.
iUSA only: This device has been approved by
the FCC as a"Vehicular Radar System". The
radar sensor is intended for use in an auto-
motive radar system only. Removal, tamper-
ing, or altering of the device will void any war-
ranties, and is not permitted by the FCC. Do not tamper with, alter, or use in any non-
approved way.
An
yu nauthorized modification to this device
could void the user's authority to operate the
equipment.
iCanada only: This device complies wit h
RSS-210 of Industry Canada. Operation is
subject to the following two conditions:
1. This device may not cause interference,
and
2. This device must accept any interference
received, including interference that may
cause undesired operation of the device.
Removal, tampering, or altering of the device
will void any warranties, and is not permitted. Do not tamper with, alter, or use in any non-
approved way.
An yu nauthorized modification to this device
could void the user's authority to operate the
equipment.
Important safety notes
GWARNING
Distance Pilot DISTRONIC does not react to:
Rpeople or animals
Rstationary object sonthe road, e.g. stopped
or parked vehicles
Roncoming vehicles and crossingt raffic
As aresult, Distance Pilot DISTRONIC may
neither give warnings nor intervene in such
situations. There is arisk of an accident.
Always pay careful attention to the traffic sit- uation and be ready to brake.
GWARNING
Distance Pilot DISTRONIC cannot always
clearly identif yother road users and complex
traffic situations.
In such cases, Distance Pilot DISTRONIC may:
Rgive an unnecessary warning and then
brake the vehicle
Rneither give awarning nor intervene
Raccelerateorb rake unexpectedly
There is arisk of an accident.
Driving systems151
Driving and parking
Z

There isashort delay before achange in outside
temperature appears in the multifunction dis-
play.
Coolant temperature gauge
GWARNING
Opening the hood when the engine is over-
heated or when there is afire in the engine
compartment could expose you to hot gases
or other service products. There is arisk of
injury.
Let an overheated engine cool down before
opening the hood. If there is afire in the
engine compartment,k eep the hood closed
and contact the fire department.
!Ad isplay message is shown if the coolant
temperature is too high.
If the coolant temperature is over 248 ‡
(120 †), do not continue driving. The engine
will otherwise be damaged.
The coolant temperature gage is in the instru-
ment cluster on the right-hand side (
Ypage 33).
The Hmarking in the coolant temperature gauge
corresponds to acoolant temperature of
approximately 248 ‡(120 †).
Under normal operating conditions and at the
correctc oolant level, the coolant temperature
gauge may rise to the Hmarking.
Operating the on-board computer
Overview
:Multifunction display
;Right control panel
=Left control panel
XTo activatet he on-board computer: turn the SmartKey to position 1in the ignition lock.
You can control the multifunction display and the settings in the on-board computer using the
button sonthe multifunction steerin gwheel.
Displays and operation177
On-board computer and displays
Z

Engine
Display messagesPossible causes/consequences andMSolutions
+
CheckCoolantLevelSee Operator'sMan‐ual
The coolant levelistoolow.
!Avoid making longj ourneys with to olittle coolant in th eengine
cooling system. The engine will otherwise be damaged.
XAdd coolant ,observing th ewarning note sbefore doings o
(Ypage 260).
If you have to ad dcoolan tfrequently:
XContac taqualified specialist workshop and have th eengine cooling
system checked.
?The fan motor is malfunctioning.
XAt coolant temperatures below 24 8‡(120 †), drive to the nearest
qualified specialist workshop.
XAvoid heavy loads on the engine as you do so, e.g. driving in moun-
tainou sterrai nand stop-and-go traffic.
?
CoolantT oo HotStop VehicleT urnEngine Off
The coolant is too hot.
Awarning tone also sounds.
GWARNING
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.
XPul lover and stop the vehicle safely and switch off the engine, pay-
ing attention to road and traffic conditions.
XSecure the vehicle against rolling away (Ypag e141).
XWai tuntil the engine has cooledd own.
XMake sure that the airsupply to the engine radiator is not blocked,
e.g. by snow, slush or ice.
XDo not start the engine again until the displaym essage goes out and
the coolant temperature is below 248 ‡(120 †). Otherwise, the
engine coul dbedamaged.
XPay attention to the coolant temperature gauge.
If the temperature increase sagain:
XVisitaq ualified specialist workshop immediately.
Under normal operating conditions and with the specified coolant
level, the coolant temperature may rise to 248 ‡(120 †).
Display messages205
On-board computer and displays
Z

Display messagesPossible causes/consequences andMSolutions
#
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 141).
XConsult aqualified specialist workshop .
#
StopVehicl eSeeOperator' sManual
The battery is no longer bein gcharged and th econditi on of charg eis
to ol ow.
Aw arning tone also sounds.
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 141).
XObserv ethe instruction sinthedisplay message #See Oper‐ator's Manual.
XConsult aqualified specialist workshop .
4
CheckEngineOilAtNextRefueling
The engin eoil level has dropped to th eminimum level.
Aw arning tone also sounds.
!Avoid lon gjou rneys wit htoo littl eengineo il. The engin ewill oth-
erwise be damaged.
XChec kthe oil level when next refueling, at th elatest (Ypage 258).
XIf necessary, add engin eoil(Ypage 259).
If th eengin eoil need stoppin gupm oreo ften:
XContac taqualified specialist workshop and hav ethe engin e
checked.
Information on approve dengineo ils can be obtained from any quali-
fie ds pecialist workshop or on th eInterne tath ttp:// bevo.mercedes -
benz.com.
æ
Fue lLevel Low
The fuel level has dropped int othe reserv erange.
XRefue lattheneares tgas station .
206Display messages
On-boardc omputer andd isplays

Display messagesPossible causes/consequences andMSolutions
StopVehicl eShifttoPLeave EngineRunnin g
The automatic transmission has overheated.
XDrive on carefully.
The automatic transmission is available again when th edisplay
message goe sout.
If th emultifunction display still shows th edisplay message :
XPull overand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 141).
XWait until th eautomatic transmission has cooled down and th edis-
play message has disappeared.
Auxiliary Batter yMalfunctionThe auxiliary battery for th eautomatic transmission is no longer bein g
charged.
XVisit aqualified specialist workshop .
XUntilthen, set th etransmission to position Pbefore you switch off
th ee ngine.
XBefor eleaving th evehicle, apply th eelectric parking brake.
Trans. Oil Overhea‐ted Drive on wit hCare
Mercedes-AMG vehicles: th etransmission oil has overheated.
Manual drive progra mM and th etem porarily active manual drive pro -
gra ma re no longer available. The engin epowe routput is reduced.
XAllow th evehicl etoc ooldown .
4matic CurrentlyUnavailable4MATIC has overheated. The vehicl eisonlyd riven by th efront wheels.
XDrive on .
The airflow cools 4MATIC mor equickly.
Whe nthe display message goe sout,4 MATIC is available again and
th ev ehicl eisd riven by all fou rwheels.
4matic Inoperative4MATIC is malfunctioning .The vehicl eisonlyd riven by th efront
wheels.
XVisit aqualified specialist workshop .
NThe trunk lid is open.
XClosethe trunk lid.
MThe hoo disopen.
Aw arning tone also sounds.
GWARNIN G
The open hoo dmay bloc kyour vie wwhen th evehicl eisinm otion.
There is ariskofana ccident.
XPull overand stop th evehicl esafely as soo naspossible, payin g
attention to roa dand traffic conditions.
XSecur ethe vehicl eagainst rollin gaway (Ypage 141).
XClosethe hood.
Display messages215
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 levelist oo low.
If the coolant levelisc orrect, the airflow to the engine radiator may be blocked or
the electric engine radiator fan may be defective.
The coolant is too hot and the engine is no longer being cooleds ufficiently.
XObserve the additionaldisplay messages in the multifunction display.
XPullover and stop the vehicles afelyand switch off the engine, paying attention
to road and traffic conditions.
XSecure the vehiclea gainst rolling away(Ypage141).
XLeave the vehiclea nd keepasafe distance from the vehicleu ntil the engine has
cooledd own.
XCheck the coolant levela nd add coolant, observing the warning notes
(Ypage2 60).
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 levelm ay 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 e141).
XLeav ethe vehicle and keep asafe distance from the vehicle until the engine has
cooledd own.
XCheck the coolant levela nd add coolant, observing the warning notes
(Ypag e260).
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.
226Warning and indicator lamps in the instrument cluster
On-board computer and displays