Page 198 of 322

&
WARNING Risk of inju rydue tomoving
parts
Cer tainc omponents in thee ngine compart‐
ment ma ycontinue tomo veor suddenly
mo veagain even af tert he ignition has been
switched off, e.g. thec ooler fan.
Ma kesur eoft hefollowing befor eperform ing
ta sk sint he engine compartment: #
Switc hthe ignition off. #
Nevertouc hthe danger zone sur round‐
ing movin gcomponent parts ,e.g.t he
ro tatio na reaoft hefan. #
Remo vejewe lrya nd watches. #
Keep items of clo thing and hair away
from moving parts. &
WARNING Risk of inju ryfrom touching
component parts unde rvoltage
The ignition sy stem and thef uel injection sys‐
te mw orku nde rhigh voltage. If yout ouch
component parts whic hareunde rvoltage,
yo uc oul drecei vean electric shoc k. #
Nevertouc hcomponent parts of the
ignition sy stem or thef uel injection sys‐
te mw hen thei gnition is switched on. Liv
ec omponents of thef uel injection sy stem
include thei njec tors,for example.
Liv ec omponent softhe ignition sy stem include
th ef ollowing:
R Ignition coils
R Spar kplug connec tors
R Diagnostic soc ket &
WARNING Risk of bu rnsf romh otcom‐
ponent parts in thee ngine compartment
Cer tainc omponents in thee ngine compart‐
ment can be very hot, e.g. thee ngine, the
ra diator and parts of thee xhau stsystem. #
Allo wthe engine tocool down and only
to uc hc omponent parts desc ribed in the
fo llowing. If
yo uh ave tocar ryout an yworkint he engine
compartment, touc ho nlyt he following compo‐
nents:
R Hood
R Engine oil filler openin gcap
R Washer fluid reser voir cap R
Coolant expansion reser voir cap &
WARNING Risk of inju ryfrom using the
windshield wiper swhile thee ngine hood
is open
When thee ngine hood is open and thew ind‐
shield wiper saresetinm otion, youc an be
trapped bythew iper linkage. #
Alwayss witc hoffthew indshield wipers
and ignition befor eopening thee ngine
hood. #
Park thev ehicle in asafel ocation and on a
le ve ls urface if possible. #
Switc hoffthee ngine. #
Secur ethe vehicle agains trolling away. &
WARNING Risk of inju rywhen theh ood
is opened
When youo pen theh ood, it ma ysuddenly
drop int othe end position.
Ther eisar isk of injur yfor an yone in the
hood's rang eofm ovement. #
Befor ereleasing theh ood, ensur ethat
th es uppor tisfirmlyseatedint he
holder. #
Open theh ood onl ywhen ther eisn o-
one in theh ood's rang eofm ovement. #
Toopen: pull handle 1torelease theh ood. #
Reachi ntot he gapa nd push theh ood catch
handle upwards. #
Open theh ood and hold it up. 174
Maintenance and care
Page 202 of 322

If
yo uh ave tocar ryout an yworkint he engine
compartment, touc ho nlyt he following compo‐
nents:
R Hood
R Engine oil filler openin gcap
R Washer fluid reser voir cap
R Coolant expansion reser voir cap &
WARNING Danger of bu rnsw hen open‐
ing theh ood
If yo uo pen theh ood when thee ngine has
ove rheated or during afireint he engine com‐
partment, youc oul dc om eintoc ontact wi th
ho tg ases or other escaping operating fluids. #
Befor eopening theh ood, allo wthe
engine tocool down. #
Inthee vent of afireint he engine com‐
partment, keep theh ood closed and call
th ef ires ervice. &
WARNING Risk of scalding from hot
coolant
The engine cooling sy stem is pressurized,
particular lywhen thee ngine is warm.Ify ou
open thec ap, youc oul dbes calded byhot
coolant spr aying out. #
Letthe engine cool down befor eopen‐
ing thec ap. #
When opening thec ap, wear pr otective
gl ove sand saf etyg lasses. #
Open thec ap slowl ytorelease pres‐
sure. Allo
wthe engine and thee ngine cooling sy stem
to cool down befor echecking thec oolant le velor
re filling coolant.
* NO
TEPaint wo rkdamag eduetocoolant If coolant
getsonp ainted sur faces, thep aint‐
wo rkcan be damaged. #
Addc oolant carefully. #
Remo vespilledc oolant. Checking
thec oolant le vel Example: coolant
expansion reser voir #
Park thev ehicle on an even sur face. #
Ope nthe hood (/ page173). #
Slow ly tu rncoolant expansion reser voir cap
1 half aturnc oun ter-clockwise and allow
exc ess pressur etoescape. #
Turn coolant expansion reser voir cap 1fur‐
th er and remo veit. #
Chec kthe coolant le vel.
Ther eise nough coolan tincoolan texpansion
re ser voir if thec oolant reaches theM AX
mar k.
Ad ding coolant #
Refill th ec oolant totheM AX mar konthe
coolant expansion reser voir.
Onl yuse coolan tappr oved byMercedes-Benzto
avo id damagin gthe engine cooling sy stem. #
Replace coolant expansion reser voir cap 1
and tigh tenina clockwise direction. #
Startt he engine. #
Aftera pproxima tely five minutes, switc hoff
th ee ngine again and allo wittocool down. #
Che ckthec oolant le vela ga in and add coolant
if necessar y.
% Obser
veadditional coolant information
(/ page239). 17 8
Maintenance and care
Page 282 of 322

Displa
ymessages
Possible causes/consequences and 0050 0050Solutions #
Stop in asafel ocation immediately and switc hoffthee ngine. #
Consult aqualified specialis tworks hop.
00AC
Coolant Too Hot Stop
Vehicle Turn Engine Off *T
he coolant is tooh ot. #
Stop in asafel ocation immediately and switc hoffthee ngine. &
WARNING Danger of bu rnsw hen opening theh ood
If yo uo pen theh ood when thee ngine has overheated or during
af ireint he engine compartment, youc oul dc om eintoc ontact
wi th hotg ases or other escaping operating fluids. #
Befor eopening theh ood, allo wthe engine tocool down. #
Inthee vent of afireint he engine compartment, keep the
hood closed and call thef ires ervice. &
WARNING Risk of scalding from ho tcoolant
The engine cooling sy stem is pressurized, particularly when the
engine is warm.Ify ou open thec ap, youc oul dbes calded byhot
coolant spr aying out. #
Letthe engine cool down befor eopening thec ap. #
When opening thec ap, wear pr otectiv eglove sa nd saf ety
gl asses. #
Open thec ap slowl ytorelease pressure. #
Wait until thee ngine has cooled down. #
Ensur ethat thea ir supply tothee ngine radiator is no tobstruc‐
te d.
00AC Check Coolant Level See
Operator's Manual *T
he coolant le velist oo lo w. &
WARNING Risk of scalding from ho tcoolant
The engine cooling sy stem is pressurized, particularly when the
engine is warm.Ify ou open thec ap, youc oul dbes calded byhot
coolant spr aying out. #
Letthe engine cool down befor eopening thec ap. #
When opening thec ap, wear pr otectiv eglove sa nd saf ety
gl asses. #
Open thec ap slowl ytorelease pressure. *
NO
TEEngine damag eduetoinsuf ficient coolant #
Avoid long journe yswit hinsuf ficient coolant. #
Topupc oolant (/ page177).
Regeneratio nnot possi-
ble *N
otall condition shave been me tfor rege neration of thed iesel par‐
ticulat efilter . #
Continue driving as normal until all condition shave been me tfor
re ge neration of thed iesel particulat efilter. 258
Displa ymessages and warning and indicator lamps