engine overheat MERCEDES-BENZ S CLASS 2017 Owners Manual

The ECO display consists of three bars: R
Accel. R
Constant R
Coasting
The percent value is the average value of the
three bars. The three bars and the mean value
begin at the value of 50%. A higher percentage
indicates a more economical driving style.
The ECO display does not indicate the actual fuel
consumption. A fixed percentage count in the
ECO display does not indicate a fixed consump-
tion.
Apart from driving style, consumption is
dependent on many factors such as, e.g.: R
Load R
Tire pressure R
Cold start R
Choice of route R
Active electrical consumers
These factors are not included in the ECO dis-
play.
The evaluation of your driving style is carried out
using the following three categories: R
Accel. (evaluation of all acceleration pro-
cesses) -
The bar fills up: moderate acceleration,
especially at higher speeds -
The bar empties: sporty acceleration R
Constant (assessment of driving behavior at
all times) -
The bar fills up: constant speed and avoid-
ance of unnecessary acceleration and
deceleration -
The bar empties: fluctuations in speed R
Coasting (assessment of all deceleration
processes) -
The bar fills up: anticipatory driving, keep-
ing your distance and early release of the
accelerator. The vehicle can coast without
use of the brakes. -
The bar empties: frequent braking
An economical driving style specially requires
driving at moderate engine speeds.
To achieve a higher value in the categories
Accel. and Constant :R
observe the gearshift recommendations. R
drive in drive program E .
On long journeys at a constant speed, e.g. on the
highway, only the bar for Constant
will change. The ECO display summarizes the driving char-
acteristics from the start of the journey to its
completion. For this reason, the bars change
dynamically at the beginning of the journey. On
longer journeys, there are fewer changes. For
more dynamic changes, carry out a manual
reset.
Show the ECO display ( Y
page 214).
Braking
Important safety notes
G WARNING
If you shift down on a slippery road surface in
an attempt to increase the engine's braking
effect, the 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 a slippery road surface.
Downhill gradients
! On long and steep gradients, you must
reduce the load on the brakes by shifting to a
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.
When you take advantage of engine braking, a
drive wheel may not turn for some time, e.g.
on a slippery 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
G WARNING
If you rest your foot on the brake pedal while
driving, the braking system can overheat. This
increases the stopping distance and can even
cause the braking system to fail. There is a
risk of an accident.
Never use the brake pedal as a footrest. Never
depress the brake pedal and the accelerator
pedal at the same time.166
Driving tips
Driving and parking

G DANGER
If th e exhaust pipe is blocke d or adequate
ventilation is no t possible, poisonous gase s
suc h as carbon monoxide (CO) may ente r th e
vehicle. This is th e case, e.g. if th e vehicl e
become s trapped in snow. There is a ris k of
fatal injury.
If you leav e th e engin e or th e auxiliary heating
running, mak e sur e th e exhaust pipe and area
around th e vehicl e are clear of snow. To
ensur e an adequate supply of fresh air, open a
window on th e side of th e vehicl e that is no t
facing int o th e wind.
Hav e your vehicl e winter-proofe d at a qualified
specialist workshop at th e onset of winter.
Drive particularly carefully on slipper y roa d sur -
faces. Avoid sudden acceleration , steering and
braking maneuvers . Do no t use th e cruise con-
trol or DISTRONI C PLUS.
If th e vehicl e threaten s to skid or canno t be
stoppe d when moving at low speed:X
Shift th e transmission to position N .
The outside temperature indicator is no t
designed to serve as an ice-warning device and
is therefor e unsuitable for that purpose .
Changes in th e outside temperature are dis-
played after a short delay.
Indicate d temperatures jus t abov e th e freezing
poin t do no t guarantee that th e roa d surfac e is
free of ice . The roa d may s till be icy, especially in
w ooded area s or on bridges .
You should pay special attention to roa d condi-
tion s when temperatures are around freezing
point.
Fo r mor e information on drivin g wit h snow
chains, see ( Y
page 345).
Fo r mor e information on drivin g wit h summer
tires , see ( Y
page 345).
Observ e th e note s in th e "Winte r operation " sec -
tion ( Y
page 345).
Driving systems
Mercedes-Benz Intelligent Drive
Mercedes-Ben z Intelligent Drive stand s for inno-
vative driver assistanc e and safet y systems
whic h enhance comfort and support th e driver in critical situations. Wit h these intelligen t co-ordi -
nated systems Mercedes-Ben z has set a mile -
ston e on th e pat h toward s autonomous driving.
Mercedes-Ben z Intelligent Drive embraces all
elements of active and passive safet y in on e well
though t out system – for th e safet y of th e vehi-
cle occupant s and that of other roa d users.
Further information on drivin g safet y systems
( Y
page 65).
Cruise cont rol
Gene ra l notesCruis e control maintains a constan t roa d speed
for you. It brakes automatically in order to avoid
exceedin g th e set speed. Change int o a lower
gear in goo d time on lon g and steep downhill
gradients . This is especially important if th e
vehicl e is laden . By doin g so, you will mak e use
of th e braking effec t of th e engine. This relieves
th e load on th e brak e system and prevents th e
brakes from overheating and wearing to o
quickly.
You can use cruise control if you wan t to drive at
a steady speed for a prolonged period of time.
You can store any roa d speed abov e 20 mph
(30 km/h).
Import ant safety notesIf you fail to adapt your drivin g style, cruise con-
trol can neither reduce th e ris k of an acciden t
no r override th e laws of physics . Cruis e control
canno t tak e int o accoun t th e road, traffic and
weather conditions. Cruis e control is only an
aid. You are responsibl e for maintainin g a saf e
distanc e to th e vehicl e in front, for vehicl e
speed, for braking in goo d time and for stayin g in
lane.
Do no t use cruise control :R
in roa d and traffic condition s whic h do no t
allow you to maintai n a constan t speed, e.g. in
heav y traffic or on windin g roadsR
on slipper y roa d surfaces. Braking or accel-
erating could caus e th e drive wheels to lose
traction and th e vehicl e could then skidR
when there is poor visibility, e.g. due to fog ,
heav y rain or snow
If there is a chang e of drivers, advise th e ne w
driver of th e speed stored.Driving systems 169
Driving and parking Z

R
ESP ®
intervenes or you deactivate ESP ®
R
you shift the transmission to position N while
driving.
If cruise control is deactivated, you will hear a
warning tone. You will see the Cruise Con‐
trol Off message in the multifunction display
for approximately five seconds.
When you switch off the engine, the last speed
stored is cleared.
DISTRONIC PLUS
General notes DISTRONIC PLUS regulates the speed and auto-
matically helps you maintain the distance from
the vehicle detected in front. Vehicles are detec-
ted with the aid of the radar sensor system.
DISTRONIC PLUS brakes automatically so that
the set speed is not exceeded.
Change into a lower gear in good time on long
and steep downhill gradients. This is especially
important if the 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
prevents the brakes from overheating and wear-
ing too quickly.
If DISTRONIC PLUS detects that there is a risk of
a collision, you will be warned visually and
acoustically. DISTRONIC PLUS cannot prevent a
collision without your intervention. An intermit-
tent warning tone will then sound and the dis-
tance warning lamp will light up in the instru-
ment cluster. Brake immediately in order to
increase the distance to the vehicle in front or
take evasive action provided it is safe to do so.
DISTRONIC PLUS operates in the speed range
between 0 mph (0 km/h) and 120 mph
(200 km/h).
Do not use DISTRONIC PLUS while driving on
roads with steep gradients.
As DISTR ONIC P LUS transmits radar waves, it
ca
n resemble the radar detectors of the respon-
sible authorities. You can refer to the relevant
chapter in the Operator's Manual if questions
are asked about this.
i USA 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.
Any unauthorized modification to this device
could void the user's authority to operate the
equipment.
i Canada only: This device complies with
RSS-210 of Industry Canada. Operation is
subject to the following two conditions:
1. This device may not cause harmful inter-
ference, 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.
Any unauthorized modification to this device
could voi d th e user's authority to operate the
e
quipment.
Important safety notes
G WARNING
DISTRONIC PLUS does not react to: R
people or animals R
stationary obstacles on the road, e.g. stop-
ped or parked vehicles R
oncoming and crossing traffic
As a result, DISTRONIC PLUS may neither give
warnings nor intervene in such situations.
There is a risk of an accident.
Always pay careful attention to the traffic sit-
uation and be ready to brake.
G WARNING
DISTRONIC PLUS cannot always clearly iden-
tify other road users and complex traffic sit-
uations.
In such cases, DISTRONIC PLUS may: R
give an unnecessary warning and then
brake the vehicle R
neither give a warning nor intervene R
accelerate or brake unexpectedly
There is a risk of an accident.Driving system s 171
Dr ivi ng an d parking Z

There is a short delay before a change in outside
temperature is shown in the multifunction dis-
play.
Coolant temperature gauge
G WARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
! A display message is shown if the coolant
temperature is too high.
If the coolant temperature is above 257 ‡
(125 †) do not drive any further. The engine
will otherwise be damaged.
The coolant temperature gauge is in the lower
section of the tachometer ( Y
page 35).
Under normal operating conditions and with the
specified coolant level, the coolant temperature
may rise to 255 ‡ (124 †). Operating the on-board computer
C
Instrument cluster with multifunction dis-
play D
Right control panel

Display messages
Possible causes/consequences and P Solutions
= See Operator' s Man ‐
ual The battery is no t bein g charged.
A warning tone also sounds.
Possibl e causes are: R
a defective alternato rR
a torn poly-V-belt R
a malfunction in th e electronics
! Do no t continu e driving. The engin e could otherwise overheat.X
Pull ove r and stop th e vehicl e safely and switch off th e engine, pay-
ing attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 162).X
Consult a qualified specialist workshop .
= Sto p Vehicl e See
Operator' s Manual The battery is no longer bein g charged and th e condition of charg e is
to o low.
A warning tone also sounds. X
Pull ove r and stop th e vehicl e safely and switch off th e engine, pay-
ing attention to roa d and traffic conditions.X
Secur e th e vehicl e against rollin g away ( Y
page 162).X
Observ e th e instruction s in th e = See Operator' s Manual
display message .X
Consult a qualified specialist workshop .
= Sto p Vehicl e Leave
Engine Runnin g The battery condition of charg e is to o low.X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions. Do no t continu e drivin g
under any circumstances. X
Leav e th e engin e running.X
Wait until th e display message disappear s before pullin g away.
= Start Engine See
Operator' s Manual The engin e is switched off and th e condition of charg e is to o low.X
Switc h off electrical consumer s that you do no t need, suc h as th e
rear window defroste r and interior lighting .X
Leav e th e engin e runnin g for a few minute s or drive a lon g distance.
The battery is bein g charged.Display messages 24 3
On-board computer and displays Z

Display messages
Possible causes/consequences and P Solutions
Servic e Required Do
Not Shift Gears
Visit Dealer You canno t chang e th e transmission position due to a malfunction .
A warning tone also sounds.
If transmission position D is selected:X
Drive to a qualified specialist workshop without shifting th e trans -
mission from position D .
If transmission position R , N or P is selected:X
Secur e th e vehicl e against rollin g away ( Y
page 162).X
Notify a qualified specialist workshop or breakdown service.
Reversing Not Possi‐
ble Servic e Required You canno t shift int o th e transmission position R due to a malfunction .
The transmission position s P , N or D continu e to be available.
A warning tone also sounds. X
Visit a qualified specialist workshop .
Transmission Mal ‐
function Sto p A malfunction has occurred in th e mechanical transmission compo -
nents.
A warning tone also sounds. The gearbox automatically shift s to posi-
tion N . X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions.X
Shift th e transmission to position P .X
Secur e th e vehicl e against rollin g away ( Y
page 162).X
Notify a qualified specialist workshop or breakdown service.
Sto p Vehicl e Leave
Engine Runnin g Wai t
Transmission Cool‐
ing The transmission has overheated. Pullin g away can be temporarily
impaire d or no t possible.X
Pull ove r and stop th e vehicl e safely as soo n as possible, payin g
attention to roa d and traffic conditions. Do no t continu e drivin g
under any circumstances. X
Wait until th e display message disappear s before pullin g away.
Auxiliary Batter y
Malfunction The auxiliary battery for th e transmission is no longer bein g charged.X
Visit a qualified specialist workshop .X
Unti l then , set th e transmission to position P before you switch off
th e engine. X
Befor e leaving th e vehicle, apply th e electric parking brake.

Problems with the 115 V power socket Problem
Possible causes/consequences and P Solutions
The warning lamp on the
115 V power socket is
not lit. The on-board voltage is too low because the battery is too weak. X
Start the engine.
or X
Charge the battery ( Y
page 334).
If the indicator lamp still does not light up: X
Visit a qualified specialist workshop.
The temperature of the DC/AC converter is temporarily too high. X
Remove the electronic device connector from the 115 V socket. X
Let the DC/AC converter cool down.
If the indicator lamp still does not light up after cooling down the
converter: X
Visit a qualified specialist workshop.
You have connected an electronic device that has a constant nominal
power of less than 150 watts, but has a very high switch-on current.
This device will not work. If you connect such a device, the 115 V
power socket will not supply it with power. X
Connect a suitable electronic device.
Coolbox in the rear compartment
Important safety notes
G WARNING
If you cover the ventilation grille for the cool-
box, it may overheat. There is a risk of fire.
Always make sure that the ventilation grille is
not covered.
The ventilation grille for the coolbox is in the
trunk.
The coolbox can bear a maximum load of 7.7 lb
(3.5 kg).
If you want to store a bottle in the upper com-
partment of the coolbox, the capacity of the
bottle must not exceed 17 fl. oz. (0.5 l).
Store only plastic bottles in the upper compart-
ment of the coolbox. Using the coolbox
X
Vehicles with rear seat armrest: fold down
the rear seat armrest. X
Pull handle C and fold down cover D .Features 299
Stowage and features Z

Engine compartment
Hood
Important safety notes
G WARNING
If the hood is unlatched, it may open up when
the vehicle is in motion and block your view.
There is a risk of an accident.
Never unlatch the hood while driving. Before
every trip, ensure that the hood is locked.
G WARNING
When opening and closing the hood, it may
suddenly fall into the closed position. There is
a risk of injury to persons within range of
movement of the hood.
Open and close the hood only when no one is
within its range of movement.
G WARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
G WARNING
The engine compartment contains moving
components. Certain components, such as
the radiator fan, may continue to run or start
again suddenly when the ignition is off. There
is a risk of injury.
If you need to do any work inside the engine
compartment: R
switch off the ignition R
never reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area R
remove jewelry and watches R
keep items of clothing and hair, for exam-
ple, away from moving parts
G WARNING
The ignition system and the fuel injection sys-
tem work under high voltage. If you touch
components which are under voltage, you
could get an electric shock. There is a risk of
injury.
Never touch components of the ignition sys-
tem or fuel injection system when the ignition
is switched on.
Hybrid vehicles: make sure that you read the
separate operating instructions. You could oth-
erwise fail to recognize dangers, e.g. due to high
voltage.
Opening the hood
G WARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and
touch only the components described in the
following.
G WARNING
When the hood is open and the windshield
wipers are set in motion, you can be injured by
the wiper linkage. There is a risk of injury.
Always switch off the windshield wipers and
the ignition before opening the hood.
! Make sure that the windshield wipers are
not folded away from the windshield. You
could otherwise damage the windshield wip-
ers or the hood.312
Engine compartment
Maintenance and care

Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
Hybrid vehicles: make sure that you read the
separate operating instructions. You could oth-
erwise fail to recognize dangers, e.g. due to high
voltage.
General notes Depending on your driving style, the vehicle
consumes up to 0.9 US qt (0.8 l) of oil per
600 miles (1000 km). The oil consumption may
be higher than this when the vehicle is new or if
you frequently drive at high engine speeds.
Depending on the engine, the oil dipstick may be
in a different location.
When checking the oil level: R
park the vehicle on a level surface R
the engine should be switched off for approx-
imately five minutes if the engine is at normal
operating temperature R
if the engine is not at normal operating tem-
perature, e.g. if the engine was only started
briefly, wait about 30 minutes before carrying
out the measurement
Checking the oil level using the oil dip-
stick (except S 600 and Mercedes-AMG
S 65)
Example: checking the oil level using the oil
dipstick X
Pull oil dipstick C out of the dipstick guide
tube. X
Wipe off oil dipstick C .X
Slowly slide oil dipstick C into the guide tube
to the stop, and take it out again.
If the level is between MIN mark

Example: adding engine oil X
Turn cap C counter-clockwise and remove it.X
Add engine oil.
If the oil level is at or below the MIN mark on
the oil dipstick, add 1.1 US qt (1.0 liter) of
engine oil. X
Replace cap C on the filler neck and tighten
clockwise.
Ensure that the cap locks into place securely. X
Check the oil level using the on-board com-
puter (except S 600 and Mercedes-AMG S 65)
( Y
page 314).
Further information on engine oil ( Y
page 373).
Additional service products
Important safety notes
G WARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and
touch only the components described in the
following.
G WARNING
The engine compartment contains moving
components. Certain components, such as
the radiator fan, may continue to run or start
again suddenly when the ignition is off. There
is a risk of injury. If you need to do any work inside the engine
compartment: R
switch off the ignition R
never reach into the area where there is a
risk of danger from moving components,
such as the fan rotation area R
remove jewelry and watches R
keep items of clothing and hair, for exam-
ple, away from moving parts
G WARNING
The cooling system is pressurized, particularly
when the motor is warm. If you open the cap,
you could be scalded if hot coolant sprays out.
There is a risk of injury.
Let the engine cool down before you open the
cap. Wear gloves and eye protection. Slowly
open the cap to relieve pressure.
G WARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
Checking coolant level
G WARNING
Certain components in the engine compart-
ment, such as the engine, radiator and parts
of the exhaust system, can become very hot.
Working in the engine compartment poses a
risk of injury.
Where possible, let the engine cool down and
touch only the components described in the
following.
G WARNING
The cooling system is pressurized, particularly
when the motor is warm. If you open the cap,316
Engine compartment
Maintenance and care