cooling MERCEDES-BENZ GLS 2021 Owners Manual

At
tac hin garo of lugg agera ck &
WARNIN GRisk ofacci dent dueto
exc eeding themaximum roof load
The vehicle centerofgrav ity and theusual
dr iving charact eristic sas wellas thesteer ing
and braking charact eristic salt er.
If yo uexc eed themaximum roof load, the
dr iving charact eristic s,as wellas steer ing
and braking, willbegreatl yim pair ed. #
Neverexc eed themaximum roof load
and adjus tyo ur drivin gst yle. Yo
uwill find informa tionon themaximum roof
load inthe"T ec hnical data"sect ion.
* NO
TEVehicle damag efrom non-
appr ovedro of lugg agera ck s The
vehicle could bedamag edbyroof lug‐
ga ge rack sth at have notbe en tested and
appr ovedfo rMer cedes-Benz. #
Use onlyro of lugg agera ck ste sted and
appr ovedfo rMer cedes-Benz. #
Dependi ngon theve hicle equipment,
ensur eth at thesliding sunroofcan be
full yra ised when thero of lugg agera ck
is ins talled. #
Depe ndingon theve hicle equipment,
ensur eth at theta ilg atecan befully
open edwhen thero of lugg agera ck is
ins talled. #
Position theload onthero of lugg age
ra ck insuc hawa yth at theve hicle will
no tsus tain damag eev en when itis in
mo tion . *
NO
TEDama getothepanor amaroof wit h
po we rtilt/sli dingpanel duetonon-
ap prove dro of lugg agera ck s The
panor amaroof wit hpo we rtilt/sli ding
panel maybe dama gedby thero of lugg age
ra ck ifyo uatt em pttoopen itwhen usinga
ro of lugg agera ck notte sted and appr oved
fo rMer cedes-Benz. #
When aro of lugg agera ck isins talled,
open thepanor amaroof wit hpo we r
til t/sl iding panel only ifth is has been te
sted and appr oved forMer cedes-
Benz.
The panor amaroof wit hpo we rtilt/sli ding
panel maybe raised toallo wventil ation of
th eve hicle interior . #
Secur eth ero of lugg agera ck tothero of rail‐
ing. #
Obser vethemanuf acturer'sinstallation
ins truct ions . Cup
holder Switc
hingthecooling orheat ingfunction for
th ete mp eratur e-cont rolled cup holder onor
of f &
WARNIN GRisk ofinju ryby touc hin gth e
heating elements
The cup holder's heatingelements maybe
ve ry hot.
Yo ucan burnyo urself onthem. Seats
andstow ing 13
3

This
equipment isavailable onlyforMer cedes-
Ma yba chvehicles.
Subject there frig er ator boxto amax imum load
of 7.7 lb (3.5 kg).
St oreonl yplas ticbottles intheupper compart‐
ment ofthere frig er ator box.The cont ents ofthe
bo ttle mus tbe no mor eth an 17 fl.oz.
(0.5 lite rs).
If yo udo notne ed touse there frig er ator boxfo r
an extende dpe riod, switc hit of f,defr ostit and
clean it.Afterdoing so,leavethelid open fora
time.
The refrig er ator boxwil lre duce itscooling capa‐
city orswitc hof fin thefo llo wing cases :
R Tooman yelectr icalconsumer sar etur ned
on.
R The star terbatt eryis no tsuf ficie ntly
ch arge d.
If th is isthecase, theindicat orlam pswill flash
on thebutt onforswitc hingthere frig er ator box
on and off.The cooli ngfunction willau tomati‐
cally switc hbac kon assoon asther eis suf fi‐
cie ntvoltag e. %
Toinstallth ere frig er ator boxin thecar go
com partmen tor remo veit,please contact a
qu alif ied spec ialistwo rkshop. Ex
am ple: vehicles withindividual rear seat s #
Vehicles with5-seat ervariant :fo ld do wn the
re ar armr est. #
Pull thehandle ofstow agebo x1 and fold
do wn theco verof stow agebo x2. Ex
am ple: vehicles withindividual rear seat s #
Toopen: pullthehandle ofrefrig er ator box
1 and fold do wn theco verof there frig er a‐
to rbo x. #
Toswitc hon: press butt on2 repeat edly
until anindicat orlam p(lo wcooling )lights up
or twoindicat orlam ps(high cooling )light up. 13
8
Sea tsand stow ing

Ov
ervie wof there ar oper ating unit Ex
am ple:US A
1 Setsthete mp eratur e,lef t
2 Setstheair distribution, left
3 Setsclimat econ trol to aut omat icmode
(/ page16 1)
4 Setstheair flow
5 Switches climat econtr olon/of f
(/ page 160)
Switc hesthere sidua lheat on/of f
(/ page16 3)
6 Setstheair distribution, right
7 Setsthete mp eratur e,right The
settings forth esecon dand third row of
seats (equipment- dependent )can bemade via
th ere ar oper atingunit ,th emultimedia system
(/ page16 1) or theMBUX rear table tdepend‐
ing ontheve hicle's equipment. Oper
ating theclima tecont rolsy stem Switc
hingclima tecont rolon/of f #
Toswitc hon: setth eair flow toleve l1 or
higher usingtheH button. #
Toswitc hof f:se tth eair flow toleve l0 using
th eH button.
% Ifclimat econ trol isswitc hedoff,th ewin‐
do ws mayfo gup mor equ ickl y. Swi tchof f
cli mat econtr olonly briefly. Switc
hingtheclima tecont rolin there ar
passe nger comp artment on/off #
Press butt on5.
% When climatecontr olinthesecon dseat row
is switc hedoff,th eindicat orlam pis activ a‐
te dand OFF issho wnonthere ar displa y. Switc
hingtheA/C function onoroffvia the
cont rolpan el The
A/Cfunc tion heats ,cools anddehumidif ies
th eve hicle's interior air. #
Press the0056 button.
Switc hof fth eA/C function onlybr ief ly;ot her‐
wise, thewindo wsmayfo gup mor equ ickl y.
Con densation maydr ip from theunder sideof
th eve hicle when cooling modeisactiv e.This is
no ta sign that ther eis amalfunct ion. Calling
uptheair condit ioning menu Calling
uptheair condit ioning menuusing
th emu ltim edia system #
Sele ctone ofthete mp eratur edispla ysatthe
lo we redg eof themedia display. Ac
tiv atin g/deac tivatin gthe A/Cfunc tionvia
the multi mediasy stem The
A/Cfun ction heat s,coo lsand dehumi difies
th eve hicle's interior air. 16
0
Climat eco ntro l

#
Mak esur eth at mar kedspace 2isem pty. #
Remo veSmar tKey 1 from theke yring. #
Place Sma rtKe y1 inmar kedspace 2next
to symbol 3.
The vehicle willstar taf te ra shor ttime.
If yo ure mo veSmar tKey 1 from mar ked
space 2theengine continues running .Fo r
fur ther vehicle star ts howe ver,Smar tKey 1 mus
tbe locat edinmar kedspace 2next to
symbol 3during theent ire jour ney. #
Have Smar tKey 1 checkedat aqu alif ied
spec ialistwo rkshop.
If th eve hicl edoes notst ar t: #
Place SmartKey 1 inmar kedspace 2and
lea veitth er e. #
Depr essthebr ak epedal andstar tth eve hi‐
cle using thest ar t/ stop butt on.
% Youcan also switchon thepo we rsupp lyor
th eignition withth est ar t/ stop butt on. St
arting theve hicl evia Remo teOnline serv‐
ices Cooling
orheating theve hicl eint erior before
co mmenci ngyour jour ney
Ensur eth efo llo wing beforest ar tin gth eengine:
R The legalstipulation sin thear ea wher eyo ur
ve hicle ispar kedallo wengin est ar tin gvia
smar tphon e.
R Itis saf eto star tand runth eengine where
yo ur vehicle ispar ked. R
The fuel tank issu fficien tly full.
R The star terbatt eryis suf ficie ntly charge d.
Char ging thest ar terbatt erybe fore star ting
th ejou rney
If th eve hicle batteryis disc harged, youre cei vea
messa geon your smar tphon e.Youcan then
st ar tth eve hicle withth esmar tphon eto charge
th ebatt ery. The vehicle isaut omatically
switc hedoffaf te rte nminu tes.
Ensur eth efo llo wing beforest ar tin gth eengine:
R The legalstipulation sin thear ea wher eyo ur
ve hicle ispar kedallo wengin est ar tin gvia
smar tphon e.
R Itis saf eto star tand runth eengine where
yo ur vehicle ispar ked.
R The fuel tank issu fficien tly full. 17
0
Driving and parking

Ve
hicl e
le ve l Ve
hicl es
without Off-
ro ad pac kage Ve
hicl eswith
Of f-road pack‐
ag e
Of f-road
le ve l+1 Mer
cedes -
Ma ybac hve hi‐
cles: approx‐
imat ely
+2. 0in
(+50 mm)
All other mod‐
els: appr ox‐
imat ely
+2. 4in
(+60 mm) appr
oximat ely
+1 .2 in
(+30 mm)
Spor ta pproximat ely
-0 .6 in
(-1 5mm) appr
oximat ely
-0 .6 in
(-1 5mm)
Spor t+a pproximat ely
-1 .0 in
(-2 5mm) appr
oximat ely
-1 .0 in
(-2 5mm) If
th eent ry/e xit leve lfunc tion isact ivat ed, the
ve hicle issetto theSpor t+ leve lto facil itat e ent
ering/e xiting theve hicle. When driving at
speeds ofappr oximat ely19 mp h(3 0km/h) or
abo ve,th eent ry/e xit leve lis deact ivat ed and
th eve hicle israised (/page234).
Oper ation withatrailer orbicy clerack
If th eelectr icalconnect iontothetra iler orbicy‐
cle rack ises tablished correctl y:
R Drive pr ogr am A, ;,£,=,
C andB: theve hicle remains atnor‐
mal leve lir re spectiv eof speed.
R Drive pr ogr am F andG: theve hicle
adop tsthenor mal leve lst ar tin gfrom a
spee dof 19 mp h(30 km/h).
Sy stem limit s
AI RMA TICmayno tbe available orhave onl ylimi‐
te dav ailabilit yin thefo llo wing cases :
R The overheating protect ion has been activa‐
te ddue tofreq uent leve lch ang eswit hin a
shor ttim e.The 00C4 warning lam pappear s
in themultifunc tiondispla y.
Af terth ecooling phase,thesy stem isag ain
av ailable without restriction. Se
tting thevehicl eleve l(v ehicles withAIR‐
MA TIC) &
WARNIN GRisk ofacci dent because
ve hicle leve lis toohigh
If yo udr ive at ahigh ervehicle leve l,th edr iv‐
ing charact eristic sma ybe impair eddue to
th ehigher vehicle centerofgrav ity .
The vehicle candrift outw ards, forex am ple,
when steer ing orcor ner ing. #
Alw aysch oose ave hicle leve lwhic his
suit edtothedr iving style and thero ad
sur face condi tions. &
WARNIN GRisk ofentr apment from vehi‐
cle lowe ring
Whe nlowe ring theve hicle, people could
become trapped ifth eir limbs arebe tween
th eve hicle body andthetir es orunder neath
th eve hicle. #
Mak esur eno one isunder neathth e
ve hicle orintheimmediat evicin ityof Dr
iving andparking 23
1

designed
forth ere qu iremen tsof trailer
opera tion. #
Donotch ang eth eball neckor the
tr ai le rhi tc h. The
values approvedby themanuf acturercan be
fo und ontheidentif ication platesand inthe
"T ec hn ical data"sec tionunde r"T ra iler hitch"for
th eto wing vehicle (/page406). &
WARNIN GSw erving oftheve hicle/
tr ailer combination duetoinc reased
spee d
Yo uco uld lose contro lof theve hicle/tr ailer
combination.
The vehicle/tr ailercombination mayeve ntip
ove r. #
Under nocircums tances should yo utry
to stra ight entheve hicle/tr ailercombi‐
nation byinc reasin gth espeed. #
Reduce your spee dand donotco unt er‐
st eer . #
Ifneces sary,appl yth ebr ak es. *
NO
TEDama getotheengine asare sult
of ove rheating #
Ifyo ure trof itatrai le rhi tc h, mod ifica ‐
tio ns totheengine cooling system may
be neces sary,dependin gon theve hicle
model.
When retrof itti ng atrai le rhi tc h, ob serveth e
fa stening pointson thech assis . Re
trof itti ng atrai le rhi tc his pe rm issible onlyif a
trailer loadisspec ified inyour vehicle docu‐
ments. Ifth is is no tth ecase, theve hicle isno t
appr ovedfo rtr ail er oper ation.
Fu rther information canbeobt ained ataqu ali‐
fi ed specialis two rkshop.
If th etrailer coupling isde tach able, itis esse n‐
tial tocom plywith theoper ating instruction sof
th etrailer coupling manufacturer.
Couple anduncouple thetrailer carefull y.Ifyo u
do notcon nectth etra iler totheto wing vehicle
cor rectl y,thetrailer maybecome detach ed. Obser
vethefo llo wing noteson theto ngu e
we ight :
R Donotuse ato ngu ewe ight that exceed sor
fa lls belo wtheper missible tongu ewe ight
R Use ato ngu ewe ight asclos eas possible to
th emaximum tongu ewe ight
Do notex ceed thefo llo wing values:
R Perm issible towing capac ity
R Perm issible rear axle load oftheto wing vehi‐
cle
R Perm issible gross mass oftheto wing vehicle
R Perm issible gross mass ofthetra iler
R Maximum permissible speedofthetra iler
En sur eth efo llo wing beforest ar tin gajo ur ne y:
R The tirepr essur eon there ar axle oftheto w‐
ing vehicle issetfo ra maximu mloa d
R The lighting ofthecon nect edtrailer isoper a‐
tion al
In theeve ntofincr eased rear axle load, theve hi‐
cle/tra ilercombination mayno texc eed amaxi‐
mum speed of62 mph(1 00 km/h) forre ason s 27
0
Driving and parking

No
teson brak efluid Obser
vetheno teson oper ating fluids
(/ page39 4). &
WARNIN GRisk ofan acci dent dueto
va por pockets form ing inthebr ak esy s‐
te m
The brak efluid constantly absor bsmoi stur e
fr om theair .This lowe rstheboiling pointof
th ebr ak efluid. Ifth eboiling pointistoolow,
va por pockets ma yfo rm inthebr ak esy stem
when thebr ak es areapplied hard.
This causes thebr aking effect to be
im pair ed. #
Have thebr ak efluid rene we dat the
specif iedinterva ls. Ha
ve thebr ak efluid regular lyreplaced ata
qu alif ied spec ialistwo rkshop.
Onl yuse abr ak efluid appr ovedby Mer cedes-
Benz accor dingtoMB-F reigabe orMB- Appr oval
33 1.0. Co
olan t No
teson coolant
Obser vetheno teson oper ating fluids
(/ page39 4). &
WARNIN G‑Ri sk offire and injuryfrom
ant ifreez e
If ant ifreez ecom esintocon tact with hot
com ponent partsintheengine compart‐
ment ,it ma yignit e. #
Allo wtheengine tocool down before
ad ding anti freeze . #
Makesur eth at no ant ifreez espills out
ne xt to thefiller open ing. #
Thor oughl yclean offan yant ifreeze
fr om com pone ntpar tsbef orest ar tin g
th eve hicle. *
NO
TEDama gecau sed byinc orrect cool ‐
ant #
Onlyad dcool antthat has been pre‐
mix edwithth ere qu ired ant ifreeze pro‐
te ction.
Inf ormati ononcool antisavailable atthefo l‐
lo wing locations:
R IntheMer cedes- BenzSpecif ication sfo r
Oper ating Fluids 310.1:
- Athttps: //bevo.mer cedes-b enz.com
- IntheMer cedes- BenzBeVoapp
R Ataqu alif ied spec ialistwo rkshop *
NO
TEOverhea ting athigh outsid ete m‐
per atur es If
an inapp ropr iat ecoolant isused, the
engine cooling system isno tsuf ficie ntlypr o‐
te cted agains tov erheating andcorrosion at
high outside temp eratur es. #
Alw aysuse coolant approvedby
Mer cedes-Ben z. 398
Tech nica lda ta

#
Obser vetheins truction sin the
Mer cedes-Ben zSpecif ications forOper‐
ating Fluids310.1. Ha
ve thecoolant regular lyreplaced ataqu alif ied
spec ialistwo rkshop.
The propor tionofcor rosion inhibit or/antifr eeze
concen trat ein theengine cooling system should
be:
R Aminimum of50% (antifr eezeprotect ion
do wn toappr oximat ely-3 5°F (-37°C))
R Amaxim umof55% (antifreeze protect ion
do wn to-49 °F(-45 °C)) Co
olant capacity Mode
lC apacity
GL S450 4MATIC 20.0USqt
(1 8.9 liter s)
GL S580 4MATIC 16.6 US qt
(1 5.7 lite rs) Mer
cede s‑Maybac hC apacity
Mer cedes -Maybach
GL S60 04MA TIC 20
.0US qt
(1 8. 9liter s) No
teson windshield washer fluid Obser
vetheno teson oper ating fluids
(/ page39 4). &
WARNIN G‑Ri sk offire and injuryfrom
wind shieldwa sher concen trat e
Wi ndsh ield wa sher concen trat eis highly
fl ammab le.Itcoul dign ite if it com esinto
con tact with hotengine component partsor
th eex haus tsy stem. #
Mak esur eth at no wind shieldwa sher
concen trat espills outnext to thefiller
open ing. *
NO
TEDama getotheex terior lighting
due touns uitable windshieldwa sher fluid Uns
uitable windshieldwa sher fluid maydam‐
ag eth eplas ticsur face oftheex terior light‐
ing. #
Onlyuse windshield washer fluid whic h
is also suitable foruse onplastic sur fa‐
ces, e.g.MBSumm erFitor MB Winter‐
Fit. *
NO
TEBlocked spr aynozzl escau sed by
mixing windshieldwa sher fluids #
Donotmix MBSum merFitand MBWin‐
te rFit withot her windshield washer flu‐
ids. Do
notuse distilled orde- ionizedwa teras thefill
le ve lsen sor maybe trigg ered erro neou sly. Te
ch nica lda ta 399

Tr
aile rhitc h Gene
ralno teson thetrailer hitch Modif
ications totheengine cooling system may
be neces sary,dependin gon theve hicle model.
The retrof itti ng ofatrai le rhi tc his only perm issi‐
ble ifato wing capac ityisspec ified inyour vehi‐
cle documents.
Fu rther information canbeobt ained ataqu ali‐
fi ed specialis two rkshop. To
wing capacit y The
tongu ewe ight isno tinc luded intheto wing
capac ity. Mod
el Towing capacit y,
br ak ed
All models 7716 .2 lbs(3 500 kg) Mer
cede s‑Maybac hT owing capa city,
br ak ed
All models 7716 .2 lbs(3 500 kg) Maximum
tongue weight andload capacity *
NO
TEDama gecau sed bythetrailer
comin gloose If
th eto ngu ewe ight used istoolow, the
tr ai le rma ycome loose . #
Theto ngu ewe ight mustno tbe belo w
11 0.2 lb(50 kg). #
Use ato ngu ewe ight that isas clo seas
poss ibletothemaximum permissible
to ngu ewe ight . *
NO
TEDama gecau sed bythebicy cle
ra ck comi ngloose Whe
nus ing abi cy cle rack ,bo th themaximal
to ngu ewe ight andthemaximal loadcapacity
should beobser ved. #
Donotexc eed theper missible load
capacity . Obser
vetheadditional noteson load capacity .To
ngue weight Model
Maximumtongue
we ight
All models 617.3 lbs (280 kg) Mer
cede s‑Maybac hM aximum tongue
we ight
All models 617.3 lbs (280 kg) Missing
values werenotye tav ailable atthetime
of going topress.
Load capacit y Model
Maximumload
All models Mer
cedes‑Ma ybachM aximumload
All mode ls Pe
rm issible rear axle load (traile roper ation ) Miss
ingvalues werenotav ailable atthetime of
going topress. 406
Tech nica lda ta

Engine
Displa
ymes sages
Possible causes/conseq uencesand0050 0050
Solutions
To switch engine off,press
and hold Start/S topbut-
ton foratleast 3secon ds
or press 3times. *Y
ouhave pressed thest ar t/ stop butt onwhile theve hicle isin mo tion. #
Information aboutswitchingoffth eengine whiledriving (/page16 9).
00BD
Che ckCoo lant Level See
Opera tor'sManu al *T
hecoolant leve lis toolow.
* NO
TEEngi nedama gedue toinsuf ficie ntcool ant #
Avoid long journeys wit hins ufficie ntcool ant. #
Addcoolant (/page326 ). #
Have theengine cooling system checkedat aqu alif ied spec ialistwo rkshop.
ÿ
Coola ntToo HotStop Vehi-
cle Turn Engine Off *T
hecoolant istooho t. #
Pull overand stop theve hicle safely and switc hof fth eengine, paying attent ion toroad and traffic condi tions. &
WARNIN GDang erofburnswhen opening thehood
If yo uopen thehood when theengine hasoverheat edordur ing afire intheengine compartmen t,yo uco uld
co me intoco ntact withho tga ses orother escaping operating fluids. #
Beforeopen ingthehood, allowtheengine tocool down. Disp
lay mess ages and warning/ indic ator lam ps 423