engine overheat MERCEDES-BENZ E-CLASS CABRIOLET 2018 Owner's Manual

0071WARNING Risk of accident due tothe
brake sy stem overheating
If yo u lea veyour foot on the brake pedal
when driving, the brake sy stem may over‐
heat.
This increases the braking dis tance and the
brake sy stem may evenfa il.
00BBNe ver use the brake pedal as a foot re st.
00BBDo not depress the brake pedal and the
accelerator pedal at the same time
while driving.
0075 NO
TEWearing out the brake linings by
continuously dep ressing the brake pedal
00BBDo not depress the brake pedal contin‐
uously whilst driving.
00BBTo use the braking ef fect of the engine,
shift toa lo werge ar in good time.
0075 NO
TEDama getothe driv etra in and the
engine when pulling away
00BBDo not warm upthe engine when the
ve hicle is stationar y.Pull away immedi‐
atel y.
00BBAvoid high engine speeds and driving at
full thro ttle until the engine has reached
operating temp erature.
00BBDo not allow the wheels tospin.
0075 NO
TEDama getothe catalytic con verter
due tonon-combu sted fuel
The engine is not running smoot hly and is
misfiring.
Non-combus ted fuel may get into the cata‐
lytic con verter.
00BBOnly depress the accelera tor pedal
slightl y.
00BBHave the cause rectified immediately at
a qu alified specialist workshop.
Limited braking ef fect on salt-treate dro ads:
Rdue tosalt build-up on the brake discs and
brake lining, the braking dis tance can
increase conside rably or result in braking
only on one side.
Rmaintain a much greater safe dis tance tothe
ve hicle in front.
To preve nt salt build-up:
Rbrake occasionally while paying attention to
th e tra ffic conditions.
Rcarefully depress the brake pedal at the end
of the journey and when starting the next
journe y.
ECOstart/s top function
Opera ting the ECO start/s top function
The engine is au tomatically switched off if the
fo llowing conditions are me t:
RYoubr ake theve hicle toast andstill in trans‐
mission position 005Bor005C.
RAll vehicle conditions for an au tomatic
engine stop are met.
13 6
Driving and pa rking

Select one ofthefo llowing settings:
00BB(DUO\ :yo ur selection isretained when the
ve hicle is next star ted.
00BB0HGLXP :yo ur selection isretained when the
ve hicle is next star ted.
00BB/DWH: your selection isretained when the
ve hicle is next star ted.
00BB2II:
Ve hicles without Driving Assistance pack‐
age: The dis tance warning function and the
autonomous braking function are deactiva‐
te d. When theve hicle is next star ted, the
middle setting is auto matically selected.
Ve hicles with Driving Assistance pack‐
age: The dis tance warning function and the
autonomous braking function are deactiva‐
te d. Evasive Steering Assist is una vailable.
When the ignition is next star ted, the middle
setting is selected automatically and Evasive
St eering Assist is available.
00CE When Active Brake Assi stis deactivated, the
00D4 symbol appears inthe assis tance
graphic in the multifunction displa y.
Speed control cruise control
Function of cruise control
Cruise cont rol accelerates and brakes theve hi‐
cle automatically in order tomaintain a pr evi‐
ously stored speed.
If yo u accelerate toove rtake, forex ample, the
st ored speed is not dele ted. If youre mo veyour
fo ot from the accelerator pedal af terove rtaking,
cruise control will resume speed regulation back
to thestored speed.
Yo u can operate cruise cont rol with the cruise
control le ver.
If yo ufa ilto adapt your driving style, cruise con‐
trol can neither reduce therisk of an accident
nor override the la wsof ph ysics. It cannot take
into account road, weather or traf fic conditions.
Cruise control is only an aid. You are responsible
fo rth e dis tance totheve hicle in front, forve hi‐
cle speed, for braking in good time and forst ay ‐
ing in lane.
Sy stem limitations
Cruise control may be unable tomaintain the
st ored speed on uphill gradients. The stored
speed is resumed when the gradient evens out. Change into a lo
werge ar in good time on long
and steep downhill gradients. Take particular
no te ofthis when driving a laden vehicle. By
doing so, you will make use of the braking ef fect
of the engine. This relie vesth e load on the brake
sy stem and pr events the brakes from overheat‐
ing and
wearin
g tooqu ickl y.
Do not use cruise control in thefo llowing situa‐
tions:
RIn traf fic situations whi chrequ ire frequent
ch anges of speed, e.g. in heavy traf fic, on
winding roads.
ROn slippery roads. Accelerating can cause
th e drive wheels tolose traction and the
ve hicle could then skid.
RIfyo u are driving when visibility is poor.
Ope rating cruise control
0071
WARNING Risk of accident due to
unkno wnstored speed
If yo u call up thestored speed and this is
lo we rth an your cur rent speed, theve hicle
decelerates.
16 0
Driving and pa rking

Ifyo udo not kn owthestored speed, the
ve hicle could decelerate unexpectedl y.
00BBTake into account the tra ffic situation
before calling up thestored speed.
00BBIf th estored speed is not known, store
th e desired speed again.
Change into a lo werge ar in good time on long
and steep downhill gradients. Take particular
no te ofthis when driving a laden vehicle. By
doing so, youwill make use of the braking ef fect
of the engine. This relie vesth e load on the brake
sy stem and pr events the brakes from overheat‐
ing and wearing tooqu ickl y.
Re quirements:
RCruise control is selected.
RESP®must be activated, but not inter vening.
RThe driving speed must be at least15mp h
(20 km/h).
00BBSt ore cur rent speed 2(once af terst arting
th eve hicle).
or
00BBCall up stored speed 2.00BBDeactivate cruise contro l1.
00BBPress the le ver brief ly:th estored speed is
increased 3orreduced
4 by1mp h (1 km/h).
or
00BBPress the le ver be yond the pressure point:
th estored speed is increased 3orreduced
4 by5mp h (10 km/h).
If cruise contro l has been deactivated, the cur‐
re nt driven speed is adop ted with 3or4.
Driving and parking 16
1

Coolant
Notes on coolant
Obser vethe no tes on operating fluids
(
→page 387).
0071 WARNING ‑ Risk of fire and injury from
antifreeze
If antifreeze comes into con tact wi thhot
component parts in the engine compart‐
ment, it may ignite.
00BBAllow the engine tocool down before
adding antifreeze.
00BBMake surethat no antifreeze spills out
next tothefiller opening.
00BBThoroughly clean off any antifreeze
from component parts before starting
th eve hicle.
0075 NO
TEDama gecaused byincor rect cool‐
ant
00BBOnly add coolant that has been pre‐
mixed with therequ ired antifreeze pro‐
te ction.
Fu rther information on coolant:
RIn the Mercedes-Benz Specifications for
Operating Fluids 310.1, e.g. online at
http://be vo.mercedes-benz.com.
RAt aqu alified specialist workshop.
0075 NO
TEOverheating at high outside tem‐
peratures
If an inappro priate coolant is used, the
engine cooling sy stem is not suf ficiently pro‐
te cted against overheating and cor rosion at
high outside temp eratures.
00BBAlw ays use coolant appr ovedby
Mercedes-Benz.
00BBObser vethe instructions in the
Mercedes-Benz Specifications for Oper‐
ating Fluids 310.1.
Ha ve the coolant regularly replaced at a qualified
specialist workshop.
The proportion of cor rosion inhibitor/antifreeze
concentrate in the engine cooling sy stem should
be:
Ra minimum of 50% (antifreeze pr otection
down toappr oximately -35 °F (-37 °C)).
Ra maximum of 55% (antifreeze pr otection
down to-49 °F (-45 °C)).
Coolant filling capacity
Capacity
Model Capacity
All models 12.7 US qt (12.0 l)
Note s on windshield washer fluid
Obser vethe no tes on operating fluids
(→page 387).
Te ch nical da ta391

Engine
Display messagesPossible causes/consequences and 0050Solutions
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he coolant le vel is too lo w.
0075 NO
TEEngine damage duetoinsuf ficient coolant
00BBAv oid long journe yswith insuf ficient coolant.
00BBAd d coolant.
00AC
&RRODQW 7RR +RW 6WRS 9HKL
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he coolant is too hot.
00BBPull over and stop theve hicle safely and switch off the engine, paying attention toroad and traf fic conditions.
0071
WARNING Danger of burn s when opening the hood
If yo u open the hood when the engine has overheated or during a fire inthe engine compartment, you could
come into contact with hot gases or other escaping operating fluids.
00BBBefore opening the hood, allow the engine tocool down.
00BBIntheeve nt of a fire inthe engine compartment, keep the hood closed and call thefire service.
00BBWa it until the engine has cooled down.
00BBMake sure that the air supply tothera diator is not obstructed.
00BBAv oiding high loads on the engine, drive on tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below there d area.
Display messages and warning/indicator lamps 421

Displaymessages
Possible causes/consequences and 0050Solutions
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The transmission is malfunctioning. The transmission shifts toposition 005Cautomaticall y.
00BBPullover and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions.
00BBSwitch the transmission toposition 005D.
00BBConsult a qualified specialist workshop.
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he transmission is malfunctioning. Reversege ar can no longe r be engaged.
00BBVisit a qualified specialist workshop.
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he transmission is overheating. Pulling away may be temp orarily impaired or not possible.
00BBPull over and stop theve hicle safely as soon as possible, paying attention toroad and traf fic conditions. Do not
continue driving under any circums tances.
00BBLea vethe engine running.
00BBWa it until the display message disappears before pulling away.
$X[LOLDU\ %DWWHU\ 0DOIXQF
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he auxiliary batteryforth e transmission is no longer being charge d.
00BBVisit a qualified specialist workshop.
00BBUn tilthen, alw ays manually set the transmission toposition 005Dbefore youswit choff the engine.
00BBBefore leaving theve hicle, apply the electric parking brake.
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peration of the climate control sy stem is temp orarily restricted. Air flow and fresh air supply are set toautomatic
mode.
00BBHa ve the climate control sy stem checked at a qualified specialist workshop.
434
Display messages and warning/indicator lamps

Warning/indicator lamp
Possible causes/consequences and 0050Solutions
00AC
Coolantwarning lamp The
red coolant warning lamp is lit while the engine is running.
Po ssible causes are:RThe temp erature sensor is malfunctioning
RCoolant le velto o low
RThe air supply tothera diator is obstructed
RThe radiator fan is de fective
If th ere is an additional warning tone, the coolant temp erature has exceeded the maximum permissible temp erature.
0071
WARNING Danger of burn s when opening the hood
If yo u open the hood when the engine has overheated or during a fire inthe engine compartment, you could come
into contact with hot gases or other escaping operating fluids.
00BBBefore opening the hood, allow the engine tocool down.
00BBIntheeve nt of a fire inthe engine compartment, keep the hood closed and call thefire service.
00BBPull over and stop theve hicle safely and switch off the engine, paying attention toroad and traf fic conditions. Do
not continue driving under any circums tances.
00BBObser vethe messages in the multifunction displa y.
If th e coolant temp erature display is at the lo wer end of thete mp erature scale:
00BBConsult a qualified specialist workshop.
Display messages and warning/indicator lamps 457

003DStopVehicle See Operator's
Manual ................................................ 423
00CCSt opVehicle Vehicle Too Low ......414
0049Switch Off Lights .........................442
0049Switch On Headlamps .................442
Ti re Press. Monitor Cur rently
Un available .......................................... 428
Ti re Press. Monitor Inoperative ........... 429
Ti re Pressure Monitor Inoperative No
Wheel Sensors .................................... 429
Ti re s Overheated ................................. 429
Ti re s Overheated Decrease Speed ...... 430
To Deselect P or N,Dep ress Brake
and Start Engine .................................. 432
To Engage Transmiss. Position R Fir st
Dep ress the Brake .............................. .435
Tr af fic Sign Assist CameraView
Re stricted See Ope rator's Manual .......418
Tr af fic Sign Assist Currently Unavail‐
able See Operator's Manual .................418 Tr
af fic Sign Assist Inoperative..............418
Tr ansmission Malfunction Stop ........... 434
0058 Trunk Partition Open .................. 441
0049Tu rnOn the Ignition to Release
th ePa rking Brake ................................ 401
0072Ve hicle Operational Switch the
Ignition Off Before Exiting ................... 433
00CC

Ve hicle Rising Please Wait.......... .414
00CCVe hicle Rising .............................. 413
0077Wa rning Tire Malfunction ............ 428
0077Wheel Sensor(s) Missing .............429
0059 While stationar y,apply the
brakes before operating the soft top.
.............................................................4 40
Display on the windshield
see Head-up Display
Distance control see Active Dis tance Assist DISTRONIC
Di stance recorder
see Trip dis tance DI
STRO NIC
see Active Dis tance Assist DISTRONIC
Door Locking (me chanical key) ...................... 65
Opening (from inside )............................ 62
Un locking (from inside) ........................ .62
Un locking (mechanical key) .................. .65
Door cont rol panel .................................... .14
DO T,Tire Identification Number (TIN) ... 366
Drinking and driving ................................134
Driv eAwa y Assist .................................... 188
Driv eposition
Selecting .............................................. 141
Driv eprog ram display ............................. 138
Driv eprog rams
see DYNA MIC SELECT
Driving lights
see Automa

tic driving lights
Driving saf ety sy stem ............................ .153
ABS (Anti-lock Brake Sy stem) .............. 154
Ac tive Brake Assi st.............................. 156
BA S (Brake Assist System) .................. 154
47 2
Index