Page 123 of 259

Climate control121Fan speed
Adjust the air flow to select the
desired speed.
turn clockwise:increase air flowturn anti-clock‐
wise:decrease air flow
Notice
Rear air conditioning cannot be
switched on during an Autostop.
Stop-start system 3 134.
Combi
Additional air conditioning is supplied to the rear passenger compartment
via the air vents located above the
driver and front passenger
compartment.
With the front passenger
compartment air conditioning system
switched on, adjust the air flow to
select the desired speed.
Ensure the air vents are open when in
use, to prevent ice forming in the
system due to lack of air movement.
Auxiliary heaterCoolant heater
The engine-independent, fuel-
powered coolant heater provides
rapid heating of the engine coolant to
enable heating of the vehicle interior
without the engine running.
Notice
Depending on version, an additional
coolant heater may be switched on
automatically to speed up heating
when the ignition is on and the
outside temperature is below 5 ℃.9 Warning
Do not operate the system when
refuelling, when dust or
combustible vapours are present
or in enclosed spaces (e.g.
garage).
Before starting or programming the
system to start, turn the vehicle's
climate control system to heat, set the
air distribution to V and turn the fan
on.
Switch off when not required. Heating stops automatically after the
programmed runtime. It will also
cease to operate if the vehicle fuel
level drops too low.
During operation, power from the
vehicle battery is used. The driving
time should therefore be at least as
long as the heating time. For short
journey times, check the vehicle
battery regularly and recharge if
necessary.
To ensure efficient performance,
briefly operate the auxiliary heater
once a month.
Page 126 of 259

124Climate controlManual control
Depending on version, the auxiliary
heater can also be switched on for the
last duration time or the default
duration 30 minutes, or cut-off
immediately, using the button on the
instrument panel. The LED in the
button confirms operation.
Battery replacement
Replace the battery when the range
of the remote control is reduced or
when the battery charge symbol
flashes.
Open the cover and replace the
battery (Type A: CR 2430, Type B:
2CR 11108, or equivalent), ensuring
the new battery is correctly installed
with the positive ( <) side facing the
positive terminals. Replace the cover
securely.
Dispose of old batteries in
accordance with environmental
regulations.
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
Operation (Type A)
Heating Y
Select Y in the menu bar and press
G to confirm. The predetermined
heating duration, e.g. L 30, flashes in
the display. The factory setting is 30 minutes.
Adjust the heating duration using k
or l and confirm. The value can be
set from ten to 120 minutes. Due to
the power consumption, note the
heating duration.
To switch off, select Y in the menu bar
again and press d.
Ventilation x
Select x in the menu bar and press
G to confirm.
Adjust the ventilation duration using k or l and confirm. The value can
be set from ten to 120 minutes. Due
to the power consumption, note the
heating duration.
To switch off, select x in the menu bar
again and press d.
Programming P
Up to three preset departure times
can be programmed, either during
one day or over one week.
● Select P in the menu bar and
press G to confirm.
● Select desired preset memory number P1, P2 or P3 and
confirm.
Page 183 of 259

Vehicle care181● See the Owner's Manual forfurther information.
● Explosive gas may be present in the vicinity of the battery.
Additional battery
Depending on the vehicle's auxiliary
equipment, certain models may have
an additional battery mounted under
the right-hand front seat.
Notice
The additional battery is
automatically connected to the main vehicle battery only when the engine
is running. It does not need to be
manually disconnected before
disconnecting the main vehicle
battery or before jump starting the vehicle.
Jump starting 3 211.
Diesel fuel filter
Drain diesel fuel filter of residual
water at every engine oil change.
Place a container underneath the
filter housing. Loosen the knurled
screws on the filter cover and on the
lower part of the filter by approx. one
turn, to drain off the water.
The filter is drained as soon as diesel fuel emerges from the knurled screw
at the bottom. Retighten the two
screws.
Check diesel fuel filter at shorter
intervals if the vehicle is subjected to
extreme operating conditions.
Diesel fuel system bleeding
If the fuel tank has been run dry, it will be necessary to air vent or bleed the
diesel fuel system.
Page 252 of 259

250IndexAAbsorptive Glass Mat battery .....179
Accessories and vehicle modifications .......................... 173
Adaptive forward lighting ...109, 185
AdBlue .......................... 97, 141, 219
AdBlue gauge ............................... 89
AdBlue tank ................................ 242
Adjustable air vents ...................127
AGM battery ............................... 179
Airbag and belt tensioners ...........94
Airbag deactivation ................59, 94
Airbag label................................... 55 Airbag system .............................. 55
Air conditioning regular operation ................................ 128
Air conditioning system .............. 115
Air intake .................................... 128
Air suspension ........................... 138
Air suspension system................ 213
Air vents...................................... 127
Antifreeze ................................... 176
Antilock brake system ................ 152
Antilock brake system (ABS) .......96
Anti-theft alarm system ................32
Anti-theft bolts............................. 206
Anti-theft locking system .............. 32
Anti-theft security lock ..................21
Appearance care ........................215
Armrest ........................................ 47Ashtrays ....................................... 87
Automatic light control ...............106
Automatic locking ...................22, 26
Autostop ....................... 16, 133, 134
Auxiliary heater ........................... 121
B Battery ........................................ 179
Battery discharge protection ......113
Battery, jump starting.................. 211
Belts.............................................. 51 BlueInjection ............................... 141
Bonnet ....................................... 174
Bottle holders................................ 71
Brake assist ............................... 154
Brake fluid .......................... 178, 219
Brakes ............................... 152, 178
Brake system ............................... 96
Breakdown.................................. 213
Bulb replacement ....................... 183
Bus Rear seats ................................. 48
C
Cabin bulkhead grille ....................77
Capacities .................................. 242
Cargo management system ........74
Car Pass ...................................... 20
Catalytic converter .....................140
Central locking system ................22
Centre high-mounted brake light 189