
■As soon as the windscreen mists up, press the symbol button . Press the
button once the windscreen has demisted.■
During operation of the Climatronic, an increase in engine idle speed can oc-
cur under certain circumstances in order to ensure adequate heating comfort.
Efficient handling of the cooling system
Read and observe
and on page 116 first.
The air conditioning system compressor uses power from the engine when in
cooling mode, which will affect the fuel consumption.
It recommended to open the windows or the doors of a vehicle for which the
interior has been strongly heated through the effect of direct sunlight in order
to allow the heated air to escape.
The cooling system should not be on if the windows are open.
For the sake of the environment
Pollutant emissions are also lower when fuel is being saved » page 136.
malfunctions
Read and observe
and on page 116 first.
If the cooling system does not operate at outside temperatures higher than
+5 °C, there is a problem in the system. The reasons for this may be.
› One of the fuses has blown. Check the fuse and replace if necessa-
ry » page 229 .
› The cooling system has switched off automatically for a short time because
the coolant temperature of the engine is too hot » page 32.
If you are not able to resolve the operational problem yourself, or if the cooler
output has reduced, switch off the cooling system and seek assistance from a
specialist garage.
Auxiliary heating (auxiliary heating and ventilation)
Introduction
This chapter contains information on the following subjects:
Switching on/off
122
Radio remote control
123Conditions for the functioning of auxiliary heating (auxiliary heating and venti-
lation), hereinafter referred to only as auxiliary heating.
The charge state of the vehicle battery is sufficient.
The fuel supply is adequate (the warning icon
is not lit in the display of
the instrument cluster).
Auxiliary ventilation
The auxiliary ventilation enables fresh air to flow into the vehicle interior by
switching off the engine, whereby the interior temperature is effectively de-
creased (e.g. with the vehicle parked in the sun).
Auxiliary heating (parking heating)
The auxiliary heating can be used when both when stationary, when the en-
gine is switched off, to preheat the vehicle and also while driving (e.g. during
the heating phase of the engine).
The auxiliary heater functions in connection with the air-conditioning system
or Climatronic.
The auxiliary heating also warms up the engine.
The auxiliary heating warms up the coolant by combusting fuel from the vehi-
cle tank. This heats the air flowing into the passenger compartment (if the
blower is turned on).
The heater is switched on or off automatically depending on the ambient con-
ditions to give the best possible conditions for the engine running and the in-
terior heating.
The automatic switching on and off of the heater can be turned off by a spe-
cialist garage.WARNING■ The auxiliary heating must never be operated in closed rooms (e.g. garag-
es) – risk of poisoning!■
The auxiliary heating must not be allowed to run during refuelling – risk
of fire.
■
The exhaust pipe of the auxiliary heating is located on the underside of
the vehicle. If you want to use the heater, do not park the car in places
where the exhaust fumes can come into contact with flammable materials
such as dry grass, undergrowth, leaves, spilled fuel etc. - risk of fire.
121Heating and air conditioning

CAUTION■Just filling the tank once with diesel fuel that does not comply with the
standard, can cause severe damage to parts of the engine, the fuel and ex-
haust system!■
If a different fuel other than diesel fuel, which complies to the above men-
tioned standards (e.g. petrol) is used, do not start the engine or switch on the
ignition! Extensive damage to engine parts can occur!
■
Water which has collected in the fuel filter can cause engine faults.
CAUTION
■ The vehicle cannot be operated with bio fuel RME, therefore this fuel must
not be filled in the tank and used for driving the vehicle. The use of biofuel
RME can cause considerable damage to parts of the engine or fuel system.■
Do not mix any fuel additives, so-called “flow improvers” (petrol and similar
agents) into the diesel. This can result in considerable damage to parts of the
engine or the exhaust system.
Refuelling with CNG (compressed natural gas)
Fig. 182
Natural gas filler tubes
Read and observe
and on page 188 first.
Natural gas refuelling can be carried out if the following conditions are met. The vehicle is unlocked.
The engine and the ignition are switched off.
The auxiliary heating and ventilation is switched off » page 122.
The gas filler tube for refuelling with natural gas is located behind the fuel fill- er flap next to the petrol filler tube.
The filling couplings of the natural gas refuelling systems may differ in han-
dling. When refuelling with natural gas at unfamiliar refuelling systems, you
should seek help from trained fuel station staff. If unsure, have the refuelling done by trained fuel station staff.
Open fuel filler flap›
Open the fuel filler flap.
›
Remove cap
A
» Fig. 182 from gas filler tube
B
in direction of the arrow.
›
Plug the filling coupling of the refuelling system on the gas filler tube
B
.
The fuel tank is full when the compressor of the refuelling system automati-
cally switches off. To stop the refuelling operation prematurely, press the
“Stop ” button of the refuelling system.
Closing the filler cap
›
Check that sealing ring
C
» Fig. 182 has remained inserted in the gas filler
tube.
If sealing ring
C
has slipped onto the filling coupling, reinsert it into the gas
filler tube.
›
Plug the cap
A
onto the gas filler tube.
›
Close the bonnet.
The natural gas refuelling systems have an overfill protection relating to the
outdoor temperature. At very high outside temperatures, it may happen that
the gas tank may not be fully refuelled.
The natural gas system of your vehicle is suitable both for “slow fuelling” (fuel-
ling from small compressors) and for “quick fuelling” (fuelling from natural gas
stations with large compressors).
If the vehicle is parked for a longer period of time immediately after refuelling,
the situation may arise in which the pointer of the fuel tank gauge does not
indicate exactly the same level as was the case immediately after refuelling
when the engine is restarted. This is not due to any system leakages but a
drop in pressure in the natural gas fuel tank due to technical reasons after a
cooling phase directly after refuelling.
The maximum lifetime of the gas tank is 20 years.
The capacity of the natural gas fuel tank is approximately 15 kg.
The capacity of the gasoline fuel tank is about 50 litres, of which about 6
lighters are in reserve.
191Inspecting and replenishing

Dipstick » Fig. 187
The oil level must be within this range.
The oil can be checked and topped up, if the following conditions are satisfied. The vehicle stands on a horizontal surface.
The engine operating temperature is reached.
The engine is turned off.
The bonnet is open.
Checking the level›
Wait a few minutes until the engine oil flows back into the oil trough.
›
Pull out the dipstick.
›
Wipe the dipstick with a clean cloth and insert it again to the stop.
›
Pull the dipstick out again and check the oil level.
›
Re-insert the dipstick.
The engine consumes a little oil. The oil consumption may be as much as 0.5 l/
1000 km depending on your style of driving and the conditions under which
you operate your vehicle. Consumption may be slightly higher than this during
the first 5 000 km.
The oil level must be checked at regular intervals.
In case of low oil level, the display of the instrument cluster shows a check
mark and the corresponding message
» page 42. Check the oil level using
the dipstick as soon as possible. Add oil accordingly.
CAUTION
■ The oil level must never be above the A range » Fig. 187 – there is a risk of
damaging the exhaust system!■
If for some reason it is not possible to top up the engine oil under the current
circumstances,
do not continue driving! Switch off the engine and seek as-
sistance from a specialist garage.
■
If the oil level is above level
A
,
do not continue to drive! Switch off the
engine and seek assistance from a specialist garage.
Replenishing
Read and observe
and on page 196 first.
›
Unscrew the cap of the engine oil filler opening » Fig. 185 on page 194 .
›
Replenish the oil in portions of 0.5 litres in accordance with the correct speci-
fications » page 196 .
›
Check the oil level » page 196.
A›Screw the lid of the engine oil filler closed carefully.›Pull the dipstick out as far as the stop.
Coolant
Introduction
This chapter contains information on the following subjects:
Checking the coolant level
198
Replenishing
198
The coolant provides cooling for the motor.
It consists of water and coolant additive with additives that protect the cooling
system against corrosion and prevents furring.
The coolant additive level in the coolant must be at least 40%.
The coolant additive may be increased to a maximum of 60%.
The correct mixing ratio of water and coolant additive is to be checked if nec- essary by a specialist garage or is to be restored if necessary.
The description of the coolant is shown in the coolant expansion reser-
voir » Fig. 188 on page 198 .
WARNINGThe engine compartment of your car is a hazardous area. The following
warning instructions must be followed at all times when working in the en- gine compartment » page 192.■
The coolant is harmful to health.
■
Avoid contact with the coolant.
■
Coolant vapours are harmful to health.
■
Never open the end cover of the coolant expansion reservoir while the
engine is still warm. The cooling system is pressurized!
■
When opening the end cover of the coolant expansion reservoir, cover it
with a cloth to protect your face, hands and arms from hot steam or hot
coolant.
■
If any coolant splashes into your eyes, immediately rinse out your eyes
with clear water and contact a doctor as soon as possible.
■
Always keep the coolant in the original container, safe from people who
are not completely independent, especially children - there is a danger of
poisoning!
197Inspecting and replenishing

WARNING (Continued)■If coolant is swallowed, consult a doctor immediately.■Never spill operating fluids over the hot engine - risk of fire.
CAUTION
■If for some reason it is not possible to top up the coolant under the current
circumstances, do not continue driving! Switch off the engine and seek as-
sistance from a specialist garage.■
If the expansion tank is empty, do not top up with coolant. The system could
aerate - risk of engine damage,
do not continue driving! Switch off the en-
gine and seek assistance from a specialist garage.
■
The amount of coolant additive in the coolant must never be allowed to be
less than 40 %.
■
Over 60 % of coolant additive in the coolant reduces the antifreeze protec-
tion and coolant effectiveness.
■
A coolant additive that does not comply with the correct specification can
significantly reduce the corrosion protection of the cooling system.
■
Any faults resulting from corrosion may cause a loss of coolant and can con-
sequently result in major engine damage!
■
Do not fill the coolant above the mark
A
» Fig. 188 on page 198 .
■
If an error occurs, leading to the engine overheating, the help of a professio-
nal garage is to be sought - there is a risk of serious engine damage occurring.
■
Additional headlights and other attached components in front of the air inlet
impair the cooling efficiency of the coolant.
■
Never cover the radiator - there is a risk of the engine overheating.
Note
On vehicles that are fitted with an auxiliary heater (auxiliary heating and venti-
lation), the coolant capacity is approx. 1 l larger.
Checking the coolant level
Fig. 188
Coolant expansion reservoir
Read and observe and on page 197 first.
The coolant expansion bottle is located in the engine compartment.
Coolant expansion tank » Fig. 188
Mark for the maximum permissible coolant level
Mark for the lowest permissible coolant level
The coolant level should be kept between the marks
A
and
B
.
The coolant can be checked and topped up, if the following conditions are sat-
isfied.
The vehicle is standing on a horizontal surface.
The engine is turned off.
The engine is not heated.
The bonnet is open.
Checking the level
›
Check the coolant level in the coolant expansion tank » Fig. 188.
If the engine is warm, the test result may be inaccurate. The level can also be
above the mark
A
» Fig. 188 .
In the event of an insufficient coolant level, the control symbol is displayed
in the instrument cluster as well as the relevant notification » page 41. We still
recommend inspecting the coolant level directly at the expansion tank from
time to time.
Loss of coolant
A loss of coolant is first and foremost an indication of a leak in the cooling sys-
tem. Do not merely top up the coolant. Have the cooling system checked by a
specialist garage.
Replenishing
Read and observe
and on page 197 first.
The coolant expansion tank must always contain a small amount of cool-
ant » page 198, in section Introduction .
›
Place a cloth over the cap of the coolant expansion reservoir and unscrew
the cap carefully .
›
Replenish the coolant.
›
Turn the cap until it clicks into place.
AB198General Maintenance

CheckingBattery electrolyte level201
Brake fluid199
Coolant198
Engine oil196
Oil level196
Windscreen washer fluid195
Checks Statutory checks
177
Children and safety22
Child safety Side airbag
24
Child safety lock58
Child safety seat Use of child safety seats
25
Child seat Classification
25
ISOFIX25
on the front passenger seat23
TOP TETHER27
Use of ISOFIX child seats26
Chrome parts see vehicle care
183
Cigarette lighter97
cleaning chrome parts
183
Cleaning Alcantara
187
and maintaining belts187
artificial leather187
headlight glasses184
materials187
natural leather186
plastic parts182
seats covers of the electrically heated seats187
wheels185
Cleaning safety belt
187
Cleaning seat covers
187
Cleaning the interiorartificial leather187
Seat covers187
Cleaning the outside of the vehicle Decorative films
183
Cleaning the vehicle exterior Camera lens
184
Cavity protection184
Door locking cylinder184
Headlight glasses184
Under-body protection185
wheels185
Windows and external mirrors183
Cleaning vehicle180
Cleaning vehicle exterior181
Plastic parts182
Rubber seals183
Vehicle paint work182
Wiper blades185
Clean interior Safety belt
187
clean outside of vehicle chrome parts
183
Climatronic air distribution control
117
Operating elements119
Closing sun roof - Version 1
67
- Version 269
Clothes hook101
CNG192
Indicator light40
Natural gas reserve display32
refuelling191
Refuelling191
Sticker192
Cockpit 12-Volt power outlet
98
Ashtray97
Cigarette lighter97
General view29
Lighting78
storage compartments94
useful equipment94
Comfort control window
66
comfort controls sun roof - Version 1
68
sun roof - Version 270
COMING HOME77
compartments94
Component protection179
Components of the puncture repair kit218
Compressed natural gas see CNG
192
Computer see multifunction display
47
convenience turn signal73
Coolant197
Checking198
Indicator symbol41
Information messages41
Replenishing198
Temperature gauge32
Cooling system cost-effective use
121
malfunctions121
CORNER See Fog lights with CORNER function
76
Correct seated position9
Driver9
Front passenger10
Instructions11
Rear seats11
Counter for distance driven33
cruise control operation
148
operation Description149
Cruise control system Warning light
40
262Index