2019 MERCEDES-BENZ CLA COUPE coolant temperature

Problem
Possible
causes/co nsequences and0050 0050
Solutions The
engine doesnot
start. Youcannot hear
the starter motor. The
on-board voltageistoo low because thebattery istoo weak or
discharged.
X Jump-start thevehicle (Ypage 282).
If the engine doesnotstart despite attemptsto jump-st artit:
X Consult aquali fiedspecialist workshop. The
starter motorwasexposed toathermal loadthatwastoohigh.
X Allow thestarter motortocool down forapproximately twominutes.
X Try tostart theengine again.
If the engine stilldoes notstart:
X Consult aquali fiedspecialist workshop. The
engine isnot running
smoothly andismisfir-
ing. There
isamalfunction inthe engine electron icsorinamechanical
componen tof the engine management system.
X Only depress theaccelerator pedalslightly.
Otherwise, non-combusted fuelmay getinto thecatalytic converter
and damage it.
X Have thecause rectified immediately ataqual ified specialist work-
shop. The
coolant temperature
gauge shows avalue
above 248‡(120 †).
The coolant warning
lamp mayalsobeon and
a warning tonemay
sound. The
coolant levelistoo low. Thecoolant istoo hotand theengine isno
longer beingcooled sufficiently.
X Stop assoon aspossible andallow theengine andthecoolant to
cool down.
X Check thecoolant level(Ypage 263). Observe thewarning notes
as you dosoand add coolant ifnecessary. Notes
ontowing vehicles
The vehicle isnot suitable forattaching towbar
systems, suchasthose usedforflat towing or
dinghy 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 vehicle.
The vehicle/trailer combinationmayswerve.
Observe thepermissible towingmethods
(Y page 287)andthenotes ontowing withboth
axles onthe ground (Ypage 286). DYNAMIC
SELECTbutt on(all vehicle s
except Mercedes-AMG vehicles)
Use theDYNAMIC SELECTbutton tochange the
drive program. Depending onthe drive program
selected thefollowing vehiclecharacterist ics
will change:
R the drive (engine andtransmission manage-
ment)
R the suspension (vehicleswithdamping sys-
tem orAMG adaptive sportsuspension sys-
tem)
R the sound ofthe exhaust system(vehicles
with sports exhaust system)
R the steering
R the availa bilityofthe ECO start/ stopfunct ion
R the climate control
Each timeyoustart theengine withtheSmart-
Key orthe Start /Stopbutton, driveprogram Cis DY
NAMIC SELECTbutt on(all vehicl esexce ptMercedes-AMG vehicles)
129Driving andparking Z

There
isashort delay before achange inoutside
temperat ureappears inthe multifunct iondis-
play. Coolant
temperaturegauge G
WARNIN
G
Opening thehood when theengine isover-
heated orwhen thereisafire inthe engine
compart mentcould expose youtohot gases
or other service products. Thereisarisk of
injury.
Let anoverheated enginecooldown before
opening thehood. Ifthere isafire inthe
engine compart ment,keep thehood closed
and cont actthe fire department . !
A
display message isshown ifthe coolant
temperat ureistoo high.
If the coolant temperat ureisover 248‡
(120 †),donot cont inue driving. Theengine
will otherwise bedamaged.
The coolant temperat uregage isin the instr u-
ment cluster onthe right- hand side(Ypage 33).
The Hmarking inthe coolant temperat uregauge
correspon dstoacoolant temperat ureof
approximately 248‡(120 †).
Under normal operating conditionsandatthe
correc tcoolant level,thecoolant temperat ure
gauge mayrisetothe Hmarking. Opera
tingtheon-board computer
Overview 0043
Multifunct iondisplay
0044 Right controlpanel
0087 Left controlpanel
X To activat ethe on-board computer:turn theSmart Keytoposition 0047inthe ignition lock.
You cancont rolthe multifunct iondisplay andthesettings inthe on-board computer usingthe
button son the multifunct ionsteerin gwheel. Displays
andoperat ion
179On-board computerand display s Z

Engine
Disp
laymes sages Possi
blecauses/cons equences and0050 0050
Solu tions 00BD
Che ck Che
ckCoo lant Coo
lantLev el Lev
el
See Operator'sMan ‐ See
Operator'sMan ‐
ual ual The
coolant levelis toolow.
! Av
oid longer journ eys when there isins ufficie ntcoo lant inthe
eng inecoo ling system. You couldot her wise damag eth eeng ine.
X Add coolant ,obse rving thewarn ingnotesbefo redoin gso
(Y page 263).
If you have toaddcoolan tfr equ ently:
X Con tacta qualifi edspec ialist workshop andhave theeng inecoo ling
syst emcheck ed. 00AC The
fanmot orismalf unctionin g.
X At coo lant temper aturesbelow 248‡( 120 †),drive tothe neare st
qua lified speci alist worksh op.
X Avoid heavyloa dson the engine asyou doso, e.g. drivi nginmoun-
tainou sterrai nand stop-and -gotraffic. 00AC
Coolan tToo Hot Coolan
tToo Hot
Stop Vehicl eTurn Stop
Vehicl eTurn
Engine Off Engine
Off The
coola ntistoo hot.
A wa rning tonealso sou nds.
G WARNING
Do not drive whenyou rengine isoverhe ated.Thiscancausesome
flu ids whichmay have leaked into theengine compartment tocatch
fire.
Steam fromtheoverhe atedengine canalso cau seseri ous burns which
can occur justbyopeni ngthe hood .
There isarisk ofinjury .
X Pul lover andstop thevehi clesafe lyand switch offthe engine, pay-
ing attention toroad andtraffic conditio ns.
X Secure thevehi cleaga inst rolling away (Y pag e142) .
X Wai tuntil theengine hascoole ddow n.
X Make surethattheairsup plytothe engine radiator isnot blocked,
e.g. bysnow, slush orice.
X Do not start theengine againuntil thedisp laymessa gegoes outand
the coola nttempera tureisbel ow 248 ‡(120 †).Otherw ise,the
engine couldbe dama ged.
X Pay attention tothe coola nttempera turedisplay.
If the temperature increase sagain :
X Visi ta qua lified speci alist worksh opimmed iately .
Under normal operatingconditio nsand with thespeci fiedcoola nt
leve l,the coola nttempera turemay riseto248 ‡(120 †). Di
splay messag es
207On-b oard comput erand displays Z