
Auxiliary heating (auxiliary heating and ventilation)
Introduction
This chapter contains information on the following subjects:
Switching on and off directly
111
System settings
111
Radio remote control
111
Conditions 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 (auxiliary 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.
For vehicles with gasoline engines, the automatic switching on and off of the
heater can be disabled in a specialist workshop.
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 switch off the car in pla-
ces where the exhaust fumes can come into contact with flammable mate-
rials such as dry grass, undergrowth, leaves, spilled fuel etc. -. risk of fire.
CAUTION
■ The running auxiliary heater consumes fuel from the vehicle tank and auto-
matically controls the filling level. If only a low quantity of fuel is present in the
fuel tank, the auxiliary heating switches off.■
The exhaust pipe of the auxiliary heating, which is located on the underside
of the vehicle, must not be clogged and the exhaust flow must not be blocked.
■
If the auxiliary heating is running, the vehicle battery discharges. If the auxili-
ary heating and ventilation has been operated several times over a longer peri-
od, the vehicle must be driven a few kilometres in order to recharge the vehi-
cle battery.
■
The air inlet in front of the windscreen must be free (e.g. of ice, snow or
leaves) to ensure that the auxiliary heating operates properly.
Note
■ The auxiliary heating only switches the blower on, if it has achieved a coolant
temperature of approx. 50 °C.■
At low outside temperatures, this can result in a formation of water vapour in
the area of the engine compartment. This is quite normal and is not an operat-
ing problem.
■
So that warm air can flow into the vehicle interior after switching on the aux-
iliary heating, you must maintain the comfort temperature normally selected
by you, leave the fan switched on and leave the air outlet vents in an open po-
sition. It is recommended to put the air flow in the position
or
.
110Using the system

Vehicles without lockable fuel filler flap›Press on the fuel filler flap in the direction of the arrow 1 according-
ly » Fig. 157 .›
Open the cover in the direction of the arrow
2
.
›
Hold the filler cap and unlock by turning the key in the direction of the arrow
3
.
›
Unscrew the tank cap in the direction of the arrow
3
.
›
Remove the tank cap and place on top of the fuel filler flap in direction of ar-
row
4
.
›
Insert the pump nozzle into the fuel filler tube as far as it will go » .
The fuel tank is full just as soon as the pump nozzle switches off for the first
time »
.
›
Remove the pump nozzle from the fuel filler neck and put it back in the
pump.
›
Screw in the tank cap in the opposite direction of the arrow
3
until it audibly
clicks into place.
›
Hold the filler cap and lock it by turning in the opposite direction of the arrow
3
. Remove the key.
›
Close the fuel filler flap until it clicks into place.
Check that the fuel filler flap is closed properly.
WARNING■ Do not smoke when refuelling and do not use a mobile phone.■Fuel vapours are explosive - can be fatal!■
Observe the local regulations regarding fuel handling.
WARNINGInstructions for filling the reserve canister■Never fill the reserve can inside the vehicle.■
Never place the reserve can on the vehicle.
■
Always place the reserve can on the floor.
■
The national legal requirements must be observed if carrying a spare can-
ister in the vehicle.
■
We do not recommend carrying any fuel canisters in your vehicle for safe-
ty reasons. in the event of an accident, these canisters can become dam-
aged and fuel may escape – risk of fire!
CAUTION■ The fuel tank is full just as soon as the pump nozzle switches off for the first
time, provided the nozzle has been operated properly. Not continue refuelling.■
Be careful when filling diesel fuel from the spare canister and then do this
slowly and cautiously – danger of contaminating the body.
Note
The fuel capacity for vehicles with front wheel drive is about 55 litres, and for
vehicles with four-wheel drive about 60 litres, with about 9 liters as reserve.
Lead-free petrol
Read and observe
on page 177 first.
The vehicle can only be operated with unleaded petrol in compliance with the
EN 228 1)
standard.
All petrol engines can be operated using petrol that contains at most 10% bio-
ethanol (E10).
Required fuel - unleaded petrol 95/91 or 92 or 93 RON
Use unleaded fuel with the octane rating 95 RON. Unleaded petrol with the
octane ratings 91, 92 or 93 RON can also be used, but may result in a slight
loss in performance and slightly increased fuel consumption »
.
Prescribed fuel - unleaded petrol min. 95 RON
Use unleaded fuel with the octane rating 95 RON or higher.
If unleaded gasoline is not available with the octane number 95 RON, in an
emergency petrol with the octane rating of 91, 92 and 93 RON can be used to
fill the tank, but this leads to a slight loss of performance and a slightly in-
creased fuel consumption »
.
Prescribed fuel - unleaded fuel 98/95 RON
Use unleaded fuel with the octane rating 98 RON or higher. Unleaded petrol
95 RON can also be used but this results in a slight loss in performance and
slightly increased fuel consumption.
In case of an emergency, you can refuel with petrol with the octane ratings 91,
92 or 93 RON, if unleaded fuel with octane rating 98 RON or 95 RON is not
available »
.
1)
In Germany also DIN 51626-1 or E10 for unleaded petrol with octane number 91 or 95 or DIN 51626-2 or E5
for unleaded petrol with octane number 95 and 98.
178General Maintenance