2020 MERCEDES-BENZ SLC coolant

Problem
Possible
causes/co nsequences and0050 0050
Solutions The
coolant tempera-
ture display showsa
value above 248‡
(120 †).The coolant
warning lampmayalso
be on and awarning
tone maysound. The
coolant levelistoo low. Thecoolant istoo hotand theengine is
no longer beingcooled sufficiently.
X Stop assoon aspossible andallow theengine andthecoolant to
cool down.
X Check thecoolant level(Ypage 243). Observe thewarning notes
as you dosoand add coolant ifnecessary. If
the coolant leveliscorrect ,the engine radiator fanmay befaulty.
The coolant istoo hotand theengine isno longer beingcooled suf-
ficiently.
X At coolant temperatures below248‡(120 †),drive tothe near-
est quali fiedspecialist workshop.
X Avoid heavy loadsonthe engine asyou doso, e.g. driving in
mountainous terrainandstop-and- gotraffic. Notes
ontowing vehicles
The vehicle isnot suitable forattaching tow
bar systems, suchasthose usedforflat tow-
ing ordinghy towing.
Att aching orusing towbarsystems mayresult
in damage tothe vehicle.
When towing avehicle withtowbarsystems,
safe driving characterist icscannot beguaran-
teed forthe towing vehicle orthe towed vehi-
cle.
The vehicle/vehicle combinationmayswerve.
Observe thepermissible towingmethods
(Y page 265)andthenotes ontowing with
both axles onthe ground (Ypage 265). DYNAMIC
SELECTbutton
Use theDYNAMIC SELECTbutton tochange
the drive program. Depending onthe drive pro-
gram selected thefollowing vehiclecharacter-
istics willchange:
R the drive (engine andtransmission manage-
ment)
R the suspension orthe adaptive adjustable
damping onlyonvehicles withAMG RIDE
CONTROL sportssuspension
R the sound ofthe exhaust system(vehicles
with sports exhaust system)
R the steering
R the availa bilityofthe ECO start/ stopfunc-
tion Each
timeyoustart theengine withtheSmart-
Key orthe Start /Stopbutton, driveprogram C
is activated. Forfurther information about
startin gthe engine, see(Ypage 119). X
Press DYNAMIC SELECTbutton 0043asmany
times asnecessary untilthedesired drive
program isselected.
The selected driveprogram appearsinthe
multifunct iondisplay .After as hort period of
time, thedisplay goesoutand thesymbol
for the selected driveprogram appears.
In addition, thecurrent driveprogram set-
tings aredisplay edbriefly inthe multimedia
system display.
i In
af ew countr ies,theECO start/ stop
funct ionisdeactivated atthe factory dueto
the availa blefuel grade. Inthis case, the
ECO start/ stopfunct ionisnot availa blein
any drive program, regardless ofthe display
in the multimedia systemdisplay.
In city traffic andstop-st arttraffic, drivepro-
gram Cis recommen ded. 124
DY
NAMIC SELECTbutt onDriving andparking

Bea
rinm indthat theoutsid etempe raturedis-
pl ay indi cates thetempe raturemea suredand
doe snotrecor dthe roa dtempe rature.
The outsid etempe raturedispl ayisin the mul-
tifu nction displ ay(Y page 170 ).
Ac hang eint he outsid etempe ratureisshow n
in the multifunction displ ayafte rad elay . Co
olant temperature gage G
WARNI
NG
Ope ning thehoodwhent he engi neisover -
hea ted orwhe nthere isaf ire inthe engi ne
compa rtment couldexpo seyout oh otgases
or other serviceprod ucts. Thereisar isk of
inju ry.
Let anover heated engi necool downbefore
ope ning thehood.Ifthere isaf ire inthe
engi necompa rtment, keepthehoodclosed
and contact thefire departme nt.
! Ad
ispl ay mess ageiss how nifthe cool ant
tempe ratureistoo high.
If the cool anttempe ratureisover 248‡
(120 †),donot continu edriving. The
engi newillother wise be damag ed.
The coolanttempe raturegage isin the instru -
ment cluster onthe right-ha ndside
(Y page 32).
The Hmarki nginthe cool anttempe rature
ga ug ec orre sponds toac ool ant tempe rature
of approxi mate ly248 ‡(120 †).
Unde rnorma lope rati ngcondi tions andatthe
corre ctcool antlevel, the cool anttempe rature
ga ug em ayrise tothe Hmarki ng. Ope
rating theon-bo ard computer
Ove rview 0043
Multifunctio ndispl ay
0044 Right control panel
0087 Left control panel
X To acti vate theon-bo ard computer: turn
the SmartKe ytop ositio n0047 inthe ignition
lock.
You cancontrol themultifunction displ ayand
the setting sint he on-bo ardcompu terusing
the buttons onthe multifunction steering
whe el.
Le ftco ntrol panel 0059
0065 R
Ca llsu pthe menu andmenu bar 0063
0064 Pres
sbriefly:
R Scrol lsin lists
R Sele ctsasubmenu orfuncti on
R In the Audi o Audi
omenu :selects the
pre vious ornext station,whe n
the preset list or stati onlist is
acti ve,oran audiot rack orvid eo
scene
R In the Tel Tel
(teleph one) menu :
swi tches tothe phoneboo kand
sel ects aname ortele pho ne
numb er Di
splay sand ope ration
169On-board computer anddispl ays Z

Disp
laymes sages Poss
iblecauses/co nsequences and 0050 0050
Solu tions Ada
ptiveHighbe am Ada
ptiveHighbe am
Ass ist Currently Ass
ist Currently
Una vailableSee Una
vailableSee
Ope rator'sM anual Ope
rator'sM anual Ad
apt ive Highbea mAssisti sd eac tivat ed and tempo rarily ino per a-
ti ve.
Pos siblecaus esare:
R The windsh ield inthec am era' sfield of vis ion isdir ty.
R Vis ibilit yisimp aire dduetoheav yrain ,sno wo rfog .
X Clean thew indsh ield.
If th es yst em detects that thec am era isfull yoper ationalagain ,the
Ada ptiveHighbeamAssist NowAvailable Ada
ptiveHighbeamAssist NowAvailable message isdis-
played .
Ad apt ive Highbea mAssisti so per ationalagain . Ada
ptiveHighbe am Ada
ptiveHighbe am
Ass ist Inoperati ve Ass
ist Inoperati ve Ad
apt ive Highbea mAssisti sf ault y.
X Vis itaq ualif iedspecialistwor kshop . Engin
e Disp
laymes sages Poss
iblecauses/co nsequences and 0050 0050
Solu tions 00AC
Che ckCoolant Che
ckCoolant
Lev elSee Opera‐ Lev
elSee Opera‐
tor 'sManual tor
'sManual The
coolan tlev el istool ow.
! Av
oid longer journ eys when there isins ufficien tc oolan tint he
en gin ecoolings yst em. You could other wise damag ethe engin e.
X Ad dc oolan t,obs erving thew arning notesb efore doin gso
( Ypage 243).
X Ifyou need toadd coolan tmoreo ften than usual, havethe engin e
co olan tsyst em checke da taq ualifiedspecialistwor kshop . 00AC The
fanmot orisdef ective.
X Ifth ec oolan ttem perat ure gage isbelo wthe Hmar king
(Y page 169), drive on tothen extq ualif iedspecialistwor kshop .
X Av oid heav yloads onthee nginea syou do so, e.g. dri vin gin
moun tainous terrain and stop- and -got raffic. Disp
laymes sage s
195On -boar dcomp uter andd ispla ys Z

Engine
Wa
rning/
ind icat or
lam p 00510051
Signa ltyp e
Possi blecauses/cons equences and0050 0050
Solu tions 00B9
0051
The yellow CheckEnginew arning lamp lightsupw hile thee ngine isrun ning.
Ther emaybe am alfunc tion,for exam ple:
R in thee ngine man agem ent
R in thef uel inject ion syst em
R in thee xhaust system
R in thei gn ition syst em
R in thef uel syst em
The emis sion limit values maybeexc eeded andthee ngine may beinemer -
gen cymod e.
X Visi taq ualifi edspec ialist workshop immediat ely.
In som estate s, you must immediat elyvisitaq ualifi edspec ialist workshop as
soon asthey ellow CheckEnginew arning lamp lightsup.This isdue tothel egal
requi rementsine ffect inthese state s.Ifin doubt ,che ck whet hersuchlegal reg-
ulati onsa pply inthes tate inwhic hyou are curren tlydriv ing. 00B6
0051
The yellow reservefuel warn inglamp lightsupw hile thee ngine isrun ning.
The fuel levelhas dro pped intot he res erverange.
X Refuel atthen ear est gas statio n. 00B6
0051
The yellow reservefuel warn inglamp flashes while thev ehicle isin mot ion.
In addit ion,the 00B9 CheckEnginew arning lamp maylight up.
The fuel fillercap isno tc losed correctlyorthef uel syst emisleak ing.
X Chec kthatthe fuel fillercap iscor rectlyclosed.
X Ifth ef uelfiller capisnot corr ectly closed :clo sethef uel fillercap.
X Ifth ef uelfiller capisclosed :visi taq ualifi edspec ialist workshop. 00AC
0051
The redcoolant warn inglamp lightsupw hile thee ngine isrun ningand the
coo lant temper aturegage isat thes tart of thes cale.
The temper aturesensor forthec oolant temper aturegage ismalf unctionin g.
The coolant temper atureisn olon ger bein gmonito red. Thereisar iskofeng ine
damag eifthe coo lant temper atureist oo high .
X Pull overand stop thev ehicle safe lyand switchoff thee ngine ,payin gatten-
tio nt or oad andtraff iccon dition s.Do notc ontin ue driv ingunde rany circum -
st anc es.
X Sec ure thev ehicle again stroll ing away (Ypage 134).
X Con sult aqualifi edspec ialist workshop. 214
Indica
torand warning lampsOn-boar dcomp uter and displa ys

If
you need todo any work inside theengine
compartment:
R switch offthe ignition
R never reach intothearea where thereisa
risk ofdanger frommoving components,
such asthe fanrotation area
R remove jewelryandwatches
R keep items ofclothing andhair, forexam-
ple, awayfrom moving parts G
WARNING
The cooling systemispressu rized,particu-
larl yw hen themotor iswarm. Ifyou open
the cap, youcould bescalde difh ot coolant
spray sout. There isar isk ofinjury.
Let the engine cooldown before youopen
the cap. Wear protective glovesandprotec-
tive eyew earwhen opening. Openthecap
slow lyto relea sepressu re. Example
X Park thevehicle onalevel surface.
Only check thecoolant levelwhen thevehi-
cle ison alevel surface andtheengine has
cooled down.
X Turn theSmartKey topositio n0048 inthe igni-
tion lock (Ypage 118).
On vehicle swithKEYLESS- GO,press the
Start/St opbutton twice(Ypage 118).
X Check thecoolant temperature gageinthe
multifu nctiondisplay.
The coolant temperature mustbebelow
158 ‡(70 †).
X Turn theSmartKey topositio n0092
(Y page 118)inthe ignition lock. X
Slowl yturn cap 0043half aturn counter-clock-
wise toallow excess pressureto escape .
X Turn cap0043further <004600520058005100570048005500100046004F00520046004E005A004C0056
0048[ and
remove it.
If the coolant isat the level ofmarker bar
0087 inthe fillerneck when cold,there is
enough coolant incoolant expansion
tank 0044.
If the coolant levelisappro ximately 0.6in
(1.5 cm)above marker bar0087inthe filler
neck when warm, thereisenough coolant in
expansion tank0044.
X Ifnecessary ,add coolant thathasbeen tes-
ted and appro vedbyMercedes-Benz.
X Repl acecap 0043and turn itclockwise asfar
as itwil lgo.
Further information oncoolant (Ypage 303).
Windshie ldwashe rsystem G
WARNING
Certai ncomponents inthe engine compart-
ment, suchasthe engine, radiator andparts
of the exhau stsystem, canbecome very
hot. Working inthe engine compartment
poses arisk ofinjury.
Where possible,let the engine cooldown
and touch onlythecomponents describedin
the follow ing. G
WARNING
If you open thehood when thedrive system
has overhea tedorduri ngafire inthe engine
compartment, youcould come intocontact
with hotgases orother escapi ngopera ting
flui ds. There isar isk ofburns.
Let the overhea tedcomponents cooldown
before opening thehood. Inthe event ofa
fire inthe engine compartment, keepthe
hood closed andcallthefire service. G
WARNING
Windshi eldwash erconcentrate ishighl y
flamma ble.Ifwindshi eldwash erconcentrate
gets onto hotcomponents ofthe engine or
the exhau stsystem, itcan ignite. Thereisa
risk offire and injury. 244
Eng
inecompar tmentMaintenanc eand care

Make
surethatwindshield washerconcen-
trate isnot spilled inthe vicinity ofthe filler
neck . Example
X To open: pullcap 0043upwa rdsbythe tab.
X Add thepremixed washerfluid.
X To close :press cap0043onto thefiller neck
until itengages.
If the washer fluidlevel drops below therec-
ommended minimumfluidlevel of1U Sqt
(1 liter), amessage appears inthe multifunc-
tion display prompting youtoadd washer fluid
(Y page 207).
Further information onwindshield washer
fluid/antifreeze (Ypage 304). Overview
ofthe engine compart -
ment Example
engine
0043 Engin eoilcap
0044 Oildipstick
0087 Brake fluidreservoir
0085 Washer fluidreservoir
0083 Coolant expansion tank ASSYST
PLUS Service
display
The ASSYST PLUS service interval displayindi-
cates theremaining timeperiod orthe remain-
ing distance tothe next regular service due
date.
Inform ationonthe type ofservice andservice
intervals (seetheseparate Maintenanc eBook-
let).
You canobtain further information froman
authorized Mercedes-Ben zCenter orat
http: //www.mbusa.com (USAonly).
i The
ASSYST PLUS service interval display
does notshow anyinformation onthe
engine oillevel. Observe thenotes onthe
engine oillevel (Ypage 242).
The multifunction displayshowsaservice dis-
play forafew seconds, e.g.:
R Service Ain..Days Service
Ain..Days
R Service ADue Service
ADue
R Service AExceeded by..Days Service
AExceeded by..Days
Depending onthe operating conditionsofthe
vehicle, theremaining timeordistance until
the next service duedate isdisplay ed.
The letter A A
or B B,p
ossibly inconn ection witha
number oranother letter,shows thetype of
service. A A
stands foram inor service andB B
for
am ajor service.
You canobtain further information froman
authorized Mercedes-Ben zCenter.
Depending onhow thevehicle isused, the
ASS YST PLUS service interval displaymay
reduce theservice interval, e.g.inthe follow-
ing situations:
X the vehicle isprimarily usedtotravel short
distances
X ifthe engine isoften leftidling forlong peri-
ods
X ifthere arefrequent coldstart phases
Mercedes-Ben zrecommen dsyou avoid such
operating conditions.
The ASSYST PLUS service interval displaydoes
not take intoaccount anyperiods oftime dur-
ing which thebattery isdisconnec ted. ASSY
STPLUS
245Maintenance andcare Z

X
Thoroughly hosedown thevehicle witha
gentle jetofwater.
X Do not point thewater jetdirectly towards
the airinlet orthe edges ofdecorative foils.
X Use plenty ofwater andrinse outthe
sponge frequent ly.
X Rinse thevehicle withclean water anddry
thoroughly withachamois.
X Do not letthe cleaning agentdryonthe
paintwork orthe decorative foils.
Carefully removealldeposits ofroad saltas
soon aspossible whendriving inwinter.
Power washers G
WARNIN
G
The water jetfrom acircular jetnozzle (dirt
blasters) cancause invisible exteriordam-
age tothe tires orchassis compon ents.
Component sdamaged inthis way may fail
unexpect edly.There isar isk ofan accident .
Do not use power washers withcircular jet
noz zles toclean thevehicle. Havedamaged
tires orchassis compon entsreplaced imme-
diately.
! Vehicles
withdecorative film:parts ofyour
vehicle arecovered withdecorative film.
Maintain adistance ofat least 27.5in
(70 cm) between thefilm-c overed partsof
the vehicle andthenozz leof the power
washer.
Infor mation aboutthecorrec tdistance is
availabl efrom theequipment manufacturer.
Move thepower washer nozzlearound when
cleaning yourvehicle.
The water temperat ureofthe power washer
must notexceed 140‡(60 †).
! Always
maintain adistance ofat least
12 in(30 cm) between thevehicle andthe
power washer nozzle. Infor mation aboutthe
correc tdistance isavailabl efrom theequip-
ment manufact urer.
Move thepower washer nozzlearound when
cleaning yourvehicle.
Do not aim directly atany ofthe following:
R Tires
R Door gaps, roofgaps, joints,etc.
R Elect ricalcompon ents R
Batt ery
R Plug-type couplings
R Light bulbs
R Seals
R Trim elements
R Vent ilation slots
Damaged sealsorelectric alcompon ents
can lead toleaks orfailures.
! If
you clean thetank fillerrecess whenitis
open, donot use apower washer. Thiscan
cause damage tothe seals orother compo-
nent s.
Cleaning thepaint work !
Do
not affix:
R stick ers
R films
R magnetic platesorsimilar items
to painted surfaces. Youcould otherwise
damage thepaintwork .
Scr atches, corrosiv edeposits, areasaffected
by corrosion anddamage causedbyinade-
quate carecannotalway sbec ompletely
repaired. Insuch cases, visitaqualified spe-
cialist workshop.
X Remove dirtimmediately, wherepossible,
while avoiding rubbingtoohard.
X Soak insect remains withinsect remover
and rinse offthe treated areasafterwards.
X Soak birddroppings withwater andrinse off
the treated areasafterwards.
X Remove treeresin, oils,fuels andgreases by
rubbing gentlywithacloth soaked inpetro-
leum ether orlighter fluid
X Remove coolantandbrake fluidwithamoist
cloth andclear water.
X Use tarremover toremove tarstains.
X Use silicone remover toremove wax.
If water nolonger forms"beads" onthe paint
surface, usethepaint careproducts recom-
mended andapproved byMercedes- Benz.This
is the case approximately everythreetofive
mont hs,depending onthe climate conditions
and thecare product used.
If dirt has penetr atedthepaint surface orif
the paint hasbecome dull,thepaint cleaner
recomm endedandapproved byMercedes-
Benz should beused. 248
CareMaintenance
andcare

Rim
Thi sist he partof the whe elon whi chthe tire
is mou nted.
GAW R(Gro ssAxleWei ght Ratin g)
The GAW Risthe maxi mum grossaxlew eigh t
rati ng. The actu alloa do nana xlem ustn eve r
excee dthe gros saxlew eigh trati ng. The gros s
axl ew eigh trati ng can befou ndonthe vehi cle
id entif ication plate onthe B-pi llar on the driv-
er's side.
Spe edrating
The speedrati ngispa rtof the tire identif ica-
tion. Itspe cifiesthe speedrang efor whi chthe
tire isap pro ved .
GVW (GrossVehi cleW eight)
The gros svehi cle weigh tincl udes the weigh t
of the vehi cleincluding fuel,tool s,the spare
whe el,a cce ssoriesinsta lled, occu pants, lug-
ga ge and thedrawbarnose weigh t,ifap plica -
bl e. The gros svehi cle weigh tm ustn ot excee d
the gros svehi cle weigh trati ng GVW Rasspeci-
fie do nthe vehi cleidentif ication plate onthe
B-pi llar on the driver' sside.
GVWR (GrossVehi cleW eight Ratin g)
The GVW Risthe maxi mum permis siblegros s
we igh tofa fullyloa ded vehicle(the weigh tof
the vehi cleincluding alla cce ssories,occu -
pa nts, fuel,lu gga geand thedrawbarnose -
we igh t,ifap plica ble). The gros svehi cle weigh t
rati ngisspe cified on the vehi cleidentif ication
pl ate onthe B-pi llar on the driver' sside.
Maxi mum loaded vehicle we ight
The maxi mum weigh tist he sumo f:
R the curb weigh tofthe vehi cle
R the weigh tofthe acce ssories
R the loadlim it
R the weigh tofthe facto ryinsta lled opti onal
equ ipment
Ki lopasc al(kP a)
Metri cunitf or tire pressu re.6.9 kPa corre -
spo nds to1p si.A nother unitfor tire pressu re
is ba r.100 kilopa scals(kPa )are the equivalent
of 1b ar. Lo
ad index
In addition tothe load-be aring index, the load
ind exmay also be imp rinte donthe sidewallo f
the tire.Thiss pecifi esthe load-be aring cap a-
city more precise ly.
Curb weight
The weigh tofa vehi clewith stand ardequip-
ment including the maxi mum capacityof fue l,
oil and coolant. Italso incl udes the air-condi -
tioni ngsystem andoptionalequ ipment ifthes e
are insta lled inthe vehi cle,but doe snot
incl udep asse ngers orlugga ge.
Maxi mum load rating
The maxi mum loadrating isthe maxi mum per-
mis siblewe igh tink ilogra msorlbsf or whi cha
tire isap pro ved .
Maxi mum permis sibl et ire press ure
Ma ximu mpermis sibletire pressu refor one
tire .
Maxi mum load on onet ire
Ma ximu mloado nonetire .Thisi sc alcul ate d
by divid ing the maxi mum axleloa do fone axle
by two.
PSI (pounds persquare inch)
As tand ardunitofm easure for tire pressu re.
As pec tratio
Re lations hipbetw eentireheight and tirewidth
in per cent.
Tire press ure
Thi sisp ressu reinsi dethe tire applying anout-
wa rdforce toeach squ are inch ofthe tire's
su rfa ce. The tirepressu reisspe cified in
pou nds persquare inch (psi) ,ink ilopa scal
(kPa )orinb ar.T he tire pressu resho uldo nly
be corre ctedwhenthe tire sarecold .
Co ldtire press ure
The tiresarecold :
R ifthe vehi clehasb eenp arked with the tires
ou to fdirect sunli ght foratleas tthree hours
and
R ifthe vehi clehasn otbee ndriven further
than 1mile( 1.6 km) 288
Al
la bo ut wh eelsand tiresWhee lsand tires