Page 225 of 353

Climate control223Maintenance
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 checkNote
Refrigerant R-134a may contain
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 in
Combi variants is filled with 1.1 kg
and has a CO 2 equivalent of
1.57 tonnes and the front and rear air
conditioning system in Bus variants
is filled with 1.7 kg and has a CO 2
equivalent of 2.43 tonnes.
Depending on vehicle, information
regarding air conditioning refrigerant
appears on a label located in the
engine compartment.
Page 226 of 353

224Driving and operatingDriving and
operatingDriving hints ............................... 225
Driving economically ...............225
Control of the vehicle ...............225
Steering ................................... 225
Starting and operating ...............226
New vehicle running-in ............226
Ignition switch positions ...........226
Starting the engine ..................227
Idle speed control ....................228
Overrun cut-off ........................ 228
Stop-start system ....................228
Parking .................................... 231
Air suspension ......................... 231
Engine exhaust .......................... 233
Diesel particle filter ..................233
Catalytic converter ...................234
AdBlue ..................................... 234
Manual transmission ..................241
Manual transmission automa‐ ted .............................................. 241
Transmission display ...............241
Starting the engine ..................242
Selector lever .......................... 242Manual mode........................... 243
Electronic driving programmes 243
Fault ........................................ 244
Interruption of power supply ....244
Brakes ........................................ 244
Antilock brake system .............244
Parking brake .......................... 245
Brake assist ............................. 246
Hill start assist ......................... 246
Ride control systems .................247
Traction Control system ..........247
Electronic Stability Control ......248
Limited-slip rear axle ...............249
Driver assistance systems .........249
Cruise control .......................... 249
Speed limiter ........................... 251
Active emergency braking .......253
Parking assist .......................... 255
Side blind spot alert .................257
Rear view camera ...................259
Lane departure warning ..........261
Fuel ............................................ 262
Fuel for diesel engines ............262
Refuelling ................................ 263
Trailer hitch ................................ 265
General information .................265
Driving characteristics and towing tips .............................. 265
Trailer towing ........................... 265Towing equipment ...................266
Trailer stability assist ...............266
Auxiliary features .......................266
Power take-off ......................... 266
Page 227 of 353

Driving and operating225Driving hints
Driving economically
ECO mode ECO mode is a function that
optimises fuel consumption. It affects
engine power and torque,
acceleration, gear shift indication,
heating, air conditioning and electrical consumers.
Activation
Press ECO. When activated ECO
appears in the Driver Information
Centre.
During driving, it is possible to
temporarily disable ECO mode, e.g. to increase engine performance, by
depressing the accelerator pedal
firmly.
ECO mode is reactivated when
pressure is reduced on the
accelerator pedal.
Deactivation
Press ECO again. ECO disappears in
the Driver Information Centre.
Driver Information Centre 3 105.
Control of the vehicle
Never coast with engine not
running (except during Autostop)
Many systems will not function in this
situation (e.g. brake servo unit, power steering). Driving in this manner is a
danger to yourself and others. All
systems function during an Autostop,
but there may be a controlled
reduction in power steering assist and
vehicle speed is reduced.
Stop-start system 3 228.Pedals
To ensure the pedal travel is
uninhibited, there must be no mats in the area of the pedals.
Use only floor mats which fit properly
and are fixed by the retainers on the
driver's side.
Driving downhill
Engage a gear when driving downhill
to ensure that sufficient brake
pressure is available.
Steering If power steering assist is lost
because the engine stops or due to a
system malfunction, the vehicle can
be steered but may require increased
effort.Caution
Vehicles equipped with hydraulic
power steering:
If the steering wheel is turned until it reaches the end of its travel, and
is held in that position for more
Page 228 of 353

226Driving and operatingthan 15 seconds, damage may
occur to the power steering
system and there may be loss of
power steering assist.Starting and operating
New vehicle running-in Do not brake unnecessarily hard for
the first few journeys and after new
disc brake pads have been fitted.
During the first drive, smoke may
occur because of wax and oil
evaporating off the exhaust system. Park the vehicle in the open for a
while after the first drive and avoid
inhaling the fumes.
Limit the engine speed to 2,500/min for the first 1,500 km.
During the running-in period fuel and engine oil consumption may be
higher and the cleaning process of
the diesel particle filter may take
place more often. Autostop may be
inhibited to allow for charging the
vehicle battery.
Stop-start system 3 228.
Diesel particle filter 3 233.
Ignition switch positions Turn key:0:ignition off: Some functions
remain active until key is
removed or driver's door is
opened, provided the ignition was
on previously1:accessory power mode: Steering wheel lock released, some
electrical functions are operable,
ignition is off2:ignition is on, diesel engine is
preheating. Control indicators
illuminate and most electrical
functions are operable3:engine start: Release key after
starting procedure begins
Page 229 of 353

Driving and operating227Steering wheel lockRemove key from ignition switch and
turn steering wheel until it engages.9 Danger
Never remove the key from
ignition switch during driving as
this will cause steering wheel lock.
Starting the engine
Manual transmission: operate clutch.
Manual transmission automated:
operate brake; transmission
automatically shifts to N.
Do not accelerate.
Turn the key to position 2 for
preheating, and hold until control
indicator N extinguishes from the
Driver Information Centre.
Note
Depending on vehicle, if a gear is
engaged during preheating, a
message may appear in the Driver
Information Centre (DIC) 3 105
indicating that the clutch pedal must be depressed when starting the
engine.
Turn key to position 3 and release.
The increased engine speed
automatically returns to normal idling
speed as the engine temperature
rises.
Start attempts should not last longer
than 15 seconds. If engine does not
start, wait 15 seconds before
repeating starting procedure. If
necessary, depress accelerator
before repeating starting procedure.
Note
Rear-wheel drive with twin rear
wheels and front-wheel drive: When
starting on a level surface with anunladen vehicle, it is recommended
that second gear is selected when
starting off.
Before restarting or to switch off the
engine, turn key back to 0.
During an Autostop, the engine can
be started by depressing the clutch
pedal.
Stop-start system 3 228.
Turbo engine warm-up
Upon start-up, engine available
torque may be limited for a short time, especially when the engine
temperature is cold. The limitation is
to allow the lubrication system to fully
protect the engine.
Page 230 of 353

228Driving and operatingIdle speed control
To increase the idle speed press the
switch. After a few seconds the
function will be activated.
The function will be deactivated
when:
● The clutch pedal is depressed.
● The accelerator pedal is depressed.
● The manual transmission automated is not in N (neutral).
● Vehicle speed is above 0 km/h. ● Control indicator j, W or C
illuminate in the instrument
cluster.
To increase or decrease the fast idle
speed rate, consult a workshop.
Note
When the fast idle function is
activated, the stop-start system is
automatically deactivated.
Stop-start system 3 228.
Overrun cut-off
The fuel supply is automatically cut off
during overrun, i.e. when the vehicle
is driven with a gear engaged but accelerator pedal is released.
Depending on driving conditions, the
overrun cut-off may be deactivated.
Stop-start system The stop-start system helps to save
fuel and to reduce the exhaust
emissions. When conditions allow, it
switches off the engine as soon as the
vehicle is at a low speed or at a
standstill, e.g. at a traffic light or in a
traffic jam.It restarts the engine automatically as
soon as the clutch pedal is depressed (manual transmission) or the brake
pedal is released (manual
transmission automated).
A vehicle battery sensor ensures that
an Autostop is only performed if the vehicle battery is sufficiently charged
for a restart.
Activation
The stop-start system is available as
soon as the engine is started, the
vehicle starts-off and the conditions
as stated below in this section are
fulfilled.
If the below conditions are not
fulfilled, an Autostop is prohibited and
control indicator \ illuminates in the
instrument cluster 3 103.
Page 231 of 353

Driving and operating229Deactivation
Deactivate the stop-start system
manually by pressing ).
Deactivation is indicated when the
LED in the button illuminates.
To reactivate, press Ï again. The
LED extinguishes in the button. The system is reactivated automatically
the next time the ignition is switched
on.
Note
When the fast idle function is
activated, the stop-start system is
automatically deactivated and
cannot be reactivated by pressing
Ï . LED in button illuminates to
indicate deactivation and a
corresponding message may
appear in the Driver Information
Centre 3 105.
Idle speed control 3 228.
AutostopManual transmission
If the vehicle is at low speed or
standstill, activate an Autostop as
follows:
● depress the clutch pedal
● move the selector lever to neutral
● release the clutch pedal
Control indicator Ï may flash if the
clutch is not released sufficiently.Manual transmission automated
If the vehicle is at a standstill, activate an Autostop as follows:
● selector lever in position D, M or
N
● depress brake pedal firmly
● do not accelerate
The engine will be switched off while
the ignition stays on if the required
conditions are fulfilled.
An Autostop is indicated when Ï
illuminates 3 103.
During an Autostop, the heating
performance, power steering and
brake performance will be
maintained. Brake assist, however, is
not available 3 246.
Note
If you exit the vehicle while the
engine is in an Autostop, a warning
chime will sound as a reminder that
the engine is on standby and has not been switched off.9 Warning
Switch off engine and ignition
before exiting the vehicle.
Conditions for an Autostop
The stop-start system checks if each
of the following conditions is fulfilled,
otherwise an Autostop will be
inhibited and control indicator \ will
illuminate.
● the stop-start system is not manually deactivated
● the bonnet is fully closed
Page 232 of 353

230Driving and operating● the vehicle battery is sufficientlycharged and in good condition
● the engine is warmed up
● the engine coolant temperature is
not too high
● the ambient temperature is not too low
● the altitude is not too high
● the slope is not too steep
● the defrosting function is not activated
● the parking assist is not in operation
● the climate control system does not inhibit an Autostop
● the rear air conditioning system is
not activated
● the brake vacuum is sufficient
● the self-cleaning function of the diesel particle filter is not active
3 233
● the vehicle has moved since the last Autostop
Otherwise an Autostop will be
inhibited.An Autostop may become
unavailable as the ambient
temperature approaches freezing
point.
Certain settings of the climate control
system may also inhibit an Autostop.
See "Climate control" chapter for
further information 3 208.
Immediately after motorway driving
an Autostop may be inhibited.
New vehicle running-in 3 226.
Vehicle battery discharge protection
To ensure reliable engine restarts, several vehicle battery discharge
protection features are implemented
as part of the stop-start system.
Restart of the engine by the driverManual transmission
With the selector lever in neutral,
depress the clutch pedal to restart the
engine.
Note
If any gear is selected, the clutch
pedal must be fully depressed to
restart the engine.If the engine does not restart first
time, depress clutch pedal fully again.Manual transmission automated
With the selector lever in position D,
M or N and the parking brake
released, release the brake pedal to
restart the engine.
Engaging reverse gear or depressing the accelerator pedal may also restart
the engine.
The control indicator Ï will extinguish
in the instrument cluster when the
engine is restarted. If certain
conditions are not fulfilled, a restart will not take place. Start using the
ignition key.
Starting the engine 3 227.
Bus
The engine is restarted automatically
when operating the power sliding
door switch on the instrument panel
during an Autostop.
Sliding door 3 30.