Page 118 of 231

116Climate controlClimate controlClimate control systems.............116
Heating and ventilation system 116
Air conditioning system ...........117
Electronic climate control system .................................... 118
Rear heating system ...............120
Rear air conditioning system ...121
Auxiliary heater ........................122
Air vents ..................................... 127
Adjustable air vents .................127
Fixed air vents ......................... 128
Glovebox cooler ......................128
Maintenance .............................. 128
Air intake ................................. 128
Air conditioning regular operation ................................ 128
Service .................................... 128Climate control systems
Heating and ventilation system
Controls for: ● temperature
● fan speed
● air distribution
Heated rear window Ü 3 43.
Temperature
red:warmblue:coldHeating will not be fully effective until
the engine has reached normal
operating temperature.
Fan speed
Adjust the air flow by switching the fan
to the desired speed.
Air distributionM:to head areaL:to head area and foot wellK:to foot wellJ:to windscreen, front door
windows and foot wellV:to windscreen and front door
windows
Intermediate settings are possible.
Demisting and defrosting the
windows
● Set temperature control to warmest level.
● Set fan speed to highest level.
● Set air distribution control to V.
● Switch on heated rear window Ü.
Page 130 of 231

128Climate controlRear air ventsDepending on vehicle, additional
adjustable air vents are located in the
rear passenger compartment.
Fixed air vents
Additional air vents are located
beneath the windscreen and door
windows, in the foot wells and,
depending on vehicle, in the rear
passenger compartment.
Glovebox cooler The air conditioning system can alsokeep the contents of the glovebox
cool.Maintenance
Air intake The air intake in front of the
windscreen in the engine
compartment must be kept clear to
allow air intake. Remove any leaves,
dirt or snow.
Air conditioning regular operation
In order to ensure continuously
efficient performance, cooling must
be operated for a few minutes once a
month, irrespective of the weather
and time of year. Operation with
cooling is not possible when outside
temperature is too low.
ServiceFor optimal cooling performance, it is
recommended to annually check the
climate control system, starting
3 years after initial vehicle
registration, including:
● functionality and pressure test
● heating functionality● leakage check
● check of drive belts
● cleaning of condenser and evaporator drainage
● performance check
Notice
Refrigerant R-134a contains
fluorinated greenhouse gases with a global warming potential of 1430.
Front air conditioning system is filled
with 0.58 kg and has a CO 2
equivalent of 0.83 tonnes, the front
and rear air conditioning system is
filled with 0.88 kg and has a CO 2
equivalent of 1.26 tonnes.
Depending on vehicle, information
regarding air conditioning refrigerant
appears on a label located in the
engine compartment.
Page 170 of 231

168Vehicle careWhen the engine oil level has
dropped to the MIN mark, top-up
engine oil.Caution
Do not allow the engine oil level to drop below the minimum level!
We recommend the use of the same
grade of engine oil that was used at
the last change.
Between the MIN and MAX marks a
volume of approx. 2.1 l for engines R9M 408, R9M 413 and R9M 415
respectively approx. 3.5 l for engines
R9M 450 and R9M 452 can be filled
in.
The engine oil level must not exceed the maximum mark MAX on the
dipstick.Caution
Overfilled engine oil must be
drained or suctioned out. If the oil
exceeds the maximum level, do
not start the vehicle and contact a
workshop.
To prevent spillage when
replenishing the engine oil, we
recommend using a funnel to top-up the engine oil. Ensure funnel is
securely located onto the filler pipe.
After topping-up, put the funnel into a
plastic bag and stow it securely.
A stabilization of the engine oil
consumption will not take place until
the vehicle has been driven several
thousand miles. Only then can the
actual degree of consumption be
established.
If consumption exceeds more than
0.6 l every 600 miles after this
running-in period, consult a
workshop.
Fit the cap on straight and tighten it.
Engine air filter
Engine air flow indicator
On certain models, an indicator is
located in the engine induction
system and indicates if the air-intake
to the engine is restricted.
Clear:No restrictionRed tell-tale:Restricted
Page 224 of 231

222IndexAAbsorptive Glass Mat battery .....171
Accessories and vehicle modifications .......................... 165
AdBlue .................. 99, 104, 140, 204
AdBlue tank ................................ 212
Adjustable air vents ...................127
AGM battery ............................... 171
Airbag and belt tensioners ...........96
Airbag deactivation ................62, 96
Airbag label............................. 58, 62
Airbag system .............................. 58
Air conditioning regular operation ................................ 128
Air conditioning system .............. 117
Air intake .................................... 128
Air recirculation ...................117, 198
Air vents...................................... 127
Alert ............................................ 103
Antifreeze ................................... 169
Antilock brake system ................ 146
Antilock brake system (ABS) .......98
Anti-theft alarm system ................36
Anti-theft bolts............................. 194
Anti-theft locking system .............. 35
Anti-theft security lock ..................24
Appearance care ........................200
Armrest ........................................ 48
Ashtrays ....................................... 88 Automatic anti-dazzle ..................41Automatic fuel cut-off ..................134
Automatic light control ...............109
Automatic locking ........................30
Autostop ............................. 133, 135
Auxiliary heater ........................... 122
B Battery .................... 20, 21, 122, 171
Battery discharge protection ......115
Battery, jump starting.................. 197
Belts.............................................. 53 Bench seat.................................... 74
Bonnet ....................................... 166
Bottle holders................................ 74 Brake and clutch fluid .................204
Brake assist ............................... 147
Brake fluid .................................. 170
Brakes ............................... 146, 170
Brake system ............................... 97
Breakdown.................................. 198
Bulb replacement ....................... 175
C Capacities .................................. 212
Car Pass ...................................... 20
Catalytic converter .....................139
Central locking system ................24
Centre high-mounted brake light 177
Changing tyre and wheel size ...190
Charging system .......................... 97
Child locks ................................... 30