2012 MERCEDES-BENZ M-Class climate control

Problems
withtherear window
defroster The
rear window defroster hasdeactivated
itself prematurely orcannot beactivated.
X Switch offany consumers thatarenot
required, e.g.reading lampsorinterior
lighting.
When thebattery issufficiently charged,
the rear window defroster isactivated
again automatically. Activating/deactivating
air-
recirculation mode
You candeactivate theflow offresh airif
unpleasant odorsareenterin gthe vehicle
from outside. Theairalready insidethe
vehicle willthen berecirculated.
The operation ofair-recirculation modeisthe
same forallcont rolpanels. G
WARNING Fogged
windows impairvisibility,
endangering youand others. Ifthe windows
begin tofog onthe inside, switching offthe
air recirculation modeimmediately should
clear interior window fogging. Ifinterior
window foggingpersists, makesuretheair
condition ingisactivated, orpress the¬
button.
X Turn theSmartK eytoposition 2in the
ignition lock.
X To activate: pressthed button.
The indicator lampinthe d button lights
up. i
In
the event ofhigh pollu tionlevels 13
or at
high outside temperatures, air-
recirculation modeisautomatically
activated. Whenair-recirculation modeis
activated automatically ,the indicator lamp
in the d button isnot lit.
Outside airisadded afterabout 30
minutes. X
To switch off:press thed button.
The indicator lampinthe d button goes
out. i Air-r
ecirculation modedeactivates
automatically :
R after approximately fiveminutes if
outside temperatures areless than about
41 ‡(5 †)
R after approximately fiveminutes if
cooling withairdehumidi ficationis
deactivated
R after approximately 30minutes ifoutside
temperatures areover about
41 ‡(5 †)
R ifyou press the¿/Á buttonand
switch oncooling withair
dehumidi fication Activating/deactivating
theresidual
heat function
The residual heatfunct ionisonly availa blein
Canada
It is possible tomake useofthe residual heat
of the engine tocont inue heating the
stationary vehicleforupto30 minutes after
the engine hasbeen switched off.The heating
time depends onthe temperature thathas
been set. i
The
blower willrun atalow speed
regardless ofthe airflow setting. i
If
you activate theresidual heatfunct ion
at high temperatures, onlythevent ilation
will beactivated. Theblower runsat
medium speed.
X Turn theSmartK eytoposition 0in the
ignition lockorremove it.
X To activate: presstheÌ/Á button.
The indicator lampinthe Ì/Á
button lightsup.
13 Automatic climatecontrolonly. Operat
ingthe climate controlsystem
133Climate control Z

X
To dea ctivate :pre ssthe Ì/Á
bu tton.
The indicator lamp inthe Ì/Á
bu tton goesou t. i Re
sidu alhea tisdeactivated
automaticall y:
R after about30 minutes
R when theignition isswitched on
R ifthe battery voltage drops
R ifthe coolant temperature istoo low Setting
theairvents Importa
ntsafety notes G
WARNING When
operating theclimate control,the air
that enters thepassenger compartment
through theairvents canbevery hotorvery
cold (depending onthe settemperature). This
could cause burnsorfrostbite tounprotected
skin inthe immediate areaofthe airvents.
Always keepsufficient distancebetween
unprotected partsofthe body andtheair
vents. Ifnecessary, usetheairdistribution
adjustment todirect theairtoair vents inthe
vehicle interior thatarenot inthe immediate
area ofunprotected skin.
In order toensure thedirect flowoffresh air
through theairvents intothevehicle interior,
please observe thefollowi ngnotes:
R keep theairinlet grille onthe hood andin
the engine compartment onthe front -
passenger sidefreeofblockages, suchas
ice, snow orleaves.
R never covertheairvents orair intake grills
in the vehicle interior. i
For
virtually draft-free ventilation, adjust
the sliders ofthe airvents tothe cent er
position. Setting
thecenter airvents :
Center airvent, left
; Center airvent, right
= Center ventthumbwheel, right
? Center ventthumbwheel, left
X To open/c lose:turnthumbwheels =
and ?tothe right orleft. Setting
theside airvents X
To open/c lose:turn thumbwheel =upor
down. Setting
theglove boxairvent
When automatic climatecontrolisactivated,
the glove boxcanbecooled, forinstance to
cool itscont ents. Thelevel ofairflow depends
on the airflow andairdistribution settings.
At high outside temperatures, opentheair
vent andactivate the"cooling withair
dehumid ification" function. 134
Setting
theairventsClimate control

!
Close theairvent ifyou donot wish to
cool theglove boxoryou have notswitched
on cooling withairdehumid ification.
Moisture-sensitive itemsstored inthe
glove boxcould otherwise bedamage d. :
Airvent thumbwheel
; Airvent
X To open: turnthumbwheel :counter-
clockwise.
X To clos e:turn thumbwheel :clockwise. Setting
therear- compart mentair
vents
Setting thecenter ventsinthe rear
compart ment Example:
centerventsinthe rear compartment
with rearcontr olpanel
: Rear-compartment airvent thumbwheel
; Rear-compartment airvent, right
= Rear controlpanel
? Rear-compartment airvent, left X
To open/c lose:turn thumbwheel :upor
down.
Setting therear- compart mentsideair
vents These
rear-compartment sideairvents are
only available ifyour vehicle has3-zone
automatic climatecontrol. :
B-pillar airvent
; Thumbwhe elfor B-pillar airvent
X To open/c lose:turn thumbwheel ;tothe
left orright. Setting
theairvents
135Climate control Z

Maximum
tireload :isthe maximum
permitted weightforwhich thetire is
approved.
Further information ontire loads
(Y page 367). Uniform
TireQuality Grading
Stand ards Overview
ofTire Quality Grading
Stand ards The
Uniform TireQuality Grading isaU.S.
Government requirement. Theirpurpose isto
provide driverswithconsist entand reliabl e
information regardingtireperformance. Tire
manufacturers arerequired tograde tires
using threeperformance factors:tread
wear :,tire tract ion;, and temperature
resistance =.Although notaGover nment of
Canada requirement,all tires made forsale in
Nort hAm eric ahave thesegrades brandedon
the sidewall. i
The
actual values fortires are vehic le-
spec ificand may deviat efro mt hevalues in
the illustration .
Where applicable, thetire grading
information canbefound onthe tire sidewa ll
between thetread shoulder andmaximum
tire width.
For example: Tread
wear Tra
ction Temp
erature 200 AA A All
passenger cartires must confor mto the
statutory safetyrequirements inaddition to
these grades. Tread
wear
The tread weargrade isac omparative rating
based onthe wear rateofthe tire when tested
under controlled conditionsonaspecified
U.S. governm entcourse. Forexample, atire
graded 150would wearoneandone-half
times aswell onthe governm entcourse asa
tire graded 100.
The relative performanc eof tires depends
upon theactual conditionsoftheir use,
however, andmay depart significant lyfrom
the norm, duetovariations indriving habits,
service practices anddifferenc esinroad
charact eristics andclimate conditions. Tr
action G
WARNIN
G The
tract iongrade assigned tothis tireis
based onstraight- aheadbraking traction
test s,and does notinclude acceleration,
corn ering, hydroplaning, orpeak traction
character istics.
The tract iongrades, fromhighest tolowest,
are AA, A,B,and C.Those grades represent
the tire's ability tostop onawet surface as
measured undercontrolled conditionson
specified governmenttest surfaces ofasphalt
and conc rete. Atire mark edCmay have poor
tr act ion perf ormance. G
WARN
ING If
ice has formed onthe road, tiretract ion will
be subst antially reduc ed.Und ersuch weathe r
con ditio ns,drive ,ste erand brak ewith
ext reme caution.
The safe speed onawet, snowcov ered oricy
road isalways lowerthanondry road
surf aces. 366
Unifor
mTir eQua lityGrad ing Stand ardsWheels and tires