Page 229 of 666

227 Controls in detail
Air conditioning
3
Alter the air distribution by turning
the air vents.
The heater is operational when the engi-
ne is running. Depending on the tempe-
rature selected and the outside
temperature, it heats or ventilates.
The dust filter removes most dust partic-
les and pollen from the outside air. The interval for replacing the filter de-
pends on environmental factors, e.g.
high air pollution. The interval may be
shorter than that indicated in the Ser-
vice Booklet.!
CAUTION
Never close all the air vents, other-
wise there is a risk of damage to the
air-conditioning system in the rear
compartment.
Heater*
Warning
G
Follow the settings recommended on the
following pages for heating or cooling.
The windows could otherwise fog up. As a
result, you could be distracted from road
and traffic conditions and cause an acci-
dent.
Warning
G
Air flowing out of the air vents in the foot-
well when the heater is in operation may
be very hot. There is, therefore, a risk of
burns to bare skin in the immediate proxi-
mity of these outlets. Keep bare skin away
from these air outlets. If necessary, direct
the airflow into a different area of the ve-
hicle interior using the air distribution
control.
nf_BA.book Page 227 Friday, January 25, 2008 3:53 PM
Page 231 of 666
229 Controls in detail
Air conditioning
3
Basic settingAir distribution control
Heating
\1
Set temperature selector control
1
(
\2
page 228) as required, but do not
turn the control below the middle po-
sition.
\1
Set airflow control
2
(\2
page 228)
as required, but do not turn the con-
trol below the second speed.
\1
Set the air distribution control as
shown.
\1
Close the center air vents.
\1
Close the air vents.
\1
Open the side air vents half-way and
direct them at the side windows.
Ventilation This setting rapidly ventilates the vehicle
interior.\1
Turn temperature selector control 1
(\2
page 228) to the lowest set-
ting (maximum cooling).
\1
Set airflow control
2
(\2
page 228)
as required, but do not turn the con-
trol below the second speed.
\1
Set air distribution control
5
(
\2
page 228) to
h
.
\1
Open as required:
\4
the center air vents
\4
the side air vents
\4
the ventilation vents
nf_BA.book Page 229 Friday, January 25, 2008 3:53 PM
Page 235 of 666
233 Controls in detail
Air conditioning
3
Rear heater* Rear heating control panel
\1To switch on:
press the switch.
The indicator lamp in the switch co-
mes on.
\1To switch off:
press the switch
again.
The indicator lamp in the switch goes
out.
Setting the airflowUse the airflow control
2
to adjust the
airflow.
\1To increase/reduce:
set the airflow
control
2
to the desired level.
Setting the temperatureOnly change the temperature in small in-
crements.
1Rear heating
2Airflow control
3Temperature selector control
iYour vehicle may be equipped with
an air-conditioning system in the rear
compartment (
\2
page 225) and/or
a rear heater*.
iIf both systems are installed and the
temperature selector control is in the
middle position, only one of the sy-
stems operates and air-recirculation
mode is active.
nf_BA.book Page 233 Friday, January 25, 2008 3:53 PM
Page 236 of 666
234 Controls in detailAir conditioning
3
\1To increase:
turn the temperature
selector control clockwise.
\1To reduce:
turn the temperature se-
lector control counterclockwise.
The fuel-fired heater booster system
heats the vehicle interior as quickly as
possible while the engine is running.The switch for the heater booster func-
tion is between the light switch and the
steering wheel.
Vehicles with auxiliary heatingVehicles without auxiliary heating*
1To switch the auxiliary heating on / off
(\2page 238)
2To switch the heater booster function
on / off
Heater booster function* iThe auxiliary heating automatically
switches to heater booster mode af-
ter the engine is started.
N54.25-2926-31
N54.25-2927-31
nf_BA.book Page 234 Friday, January 25, 2008 3:53 PM
Page 238 of 666

236 Controls in detailAuxiliary heating/ventilation*
3
\3 Auxiliary heating/ventilation*The auxiliary heating heats or ventilates
the interior to a temperature that you
have set. The auxiliary heating can be
operated with the engine switched on or
off.
The auxiliary heating is equipped with a
water heater.
Warning
G
Exhaust fumes are produced while the aux-
iliary heating is in operation. For this rea-
son, switch off the auxiliary heating in
enclosed spaces without an extraction sys-
tem, e.g. a garage.
Operation of the auxiliary heating system is
prohibited at gas stations or when refueling
your vehicle. The auxiliary heating must
therefore be switched off at refueling sta-
tions.
Warning
G
Observe the relevant safety regulations in
the case of vehicles used for the transport
of hazardous goods.
Aerosols, gas cartridges and other pressur-
ized containers transported in the vehicle
may be highly flammable and could explode
when heated.
Make sure that the containers described
are kept away from the flow of hot air from
the auxiliary heating.
Otherwise, you could endanger yourself
and others.
nf_BA.book Page 236 Friday, January 25, 2008 3:53 PM
Page 239 of 666

237 Controls in detail
Auxiliary heating/ventilation*
3
The auxiliary heating heats the coolant
and the vehicle interior and is therefore
more favorable to the engine and con-
sumes less fuel. The fuel tank must be at
least a quarter full to ensure that the
auxiliary heating/ventilation operates
correctly.
The maximum heating period is
60 minutes.
You can use the auxiliary heating / ven-
tilation to:\4
ventilate or preheat the vehicle inte-
rior and to de-ice the windows
\4
start the engine better in cold weath-
er
\4
support the vehicle’s heating system
while the engine is running and out-
side temperatures are low (heater
booster function) (
\2
page 234)
You can use the operating system to de-
fine up to three switch-on times, one of
which can be selected to switch on the
auxiliary heating / ventilation
(
\2
page 240).You can switch the auxiliary heating /
ventilation on and off immediately using:
\4
the auxiliary heating / heater booster
switch (
\2
page 238)
\4
the auxiliary heating remote control*
(\2
page 239)
iThe auxiliary heating automatically
switches to heater booster mode af-
ter the engine is started.
!
CAUTION
Switch on the auxiliary heating at reg-
ular intervals (at least once a month)
for approximately 10 minutes.
Make sure that the hot air flow is not
obstructed. The auxiliary heating
would otherwise overheat and switch
off.
nf_BA.book Page 237 Friday, January 25, 2008 3:53 PM
Page 240 of 666
238 Controls in detailAuxiliary heating/ventilation*
3
Before switching on
\1
Adjust the heat output to the desired
temperature using the temperature
control selector (
\2
page 218).
\1
Set the air distribution as required.
Operation using the switchThe switch for the auxiliary heating /
ventilation is between the light switch
and the steering wheel.
1To switch the auxiliary heating on / off
2To switch the heater booster function
on / off (\2page 235)
\1To switch the auxiliary heating on:
press and hold the
ö
switch for
more than 2 seconds:
\4
The auxiliary heating / ventilation
heats or ventilates the interior to
a temperature that you have set.
\4
The blower switches to the first
speed.
\4
The red indicator lamp in the
switch comes on. N54.25-2928-31
nf_BA.book Page 238 Friday, January 25, 2008 3:53 PM
Page 241 of 666

239 Controls in detail
Auxiliary heating/ventilation*
3
\1To switch the auxiliary heating
off:
press the
ö
switch.
or
\1
Turn the key to position
0 in the igni-
tion lock (
\2
page 111).
The red indicator lamp in the switch
goes out.The auxiliary heating operates for
around a further 2 minutes and then
switches off automatically.
Operation using the remote control*The remote control has a maximum
range of approximately 600 meters. The
range may be reduced by:\4
sources of interference
\4
solid objects between the remote
control and the vehicle
\4
the remote control being in an unfa-
vorable position
\4
transmitting from an enclosed space
You can use up to 4 remote control units
on the vehicle.
1Indicator lamp
2To switch the auxiliary heating on
3To switch the auxiliary heating off
iYou cannot use the auxiliary ventila-
tion to cool the vehicle interior to a
lower temperature than the outside
temperature.
The heating or ventilation period is
limited to 60 minutes.
nf_BA.book Page 239 Friday, January 25, 2008 3:53 PM