If the air distribution regulator of the manual air conditioning system is turned to position.
WARNING
Stale air can quickly make the driver tired and affect their concentration, which in turn can cause
collisions, accidents and serious injuries.
Never use the air recirculation mode for an extended period as no fresh air will enter the vehicle
interior.
If the cooling system is switched off, condensation can form on the windows very quickly in air
recirculation mode and reduce visibility considerably.
Switch off the air recirculation mode when it is no longer required.
NOTICE
In vehicles with an air conditioning system, do not smoke when the air recirculation mode is
switched on. The smoke can leave a residue on the cooling system evaporator and the dust and
pollen filter with pollution filter insert, producing a lasting unpleasant odour.
When reversing the vehicle, or when the wash and wipe system is being used, the air recirculation
mode will switch on to prevent odours from entering the vehicle interior.
Climatronic
If the outside temperature is very high, the manual air recirculation mode can be activated for a
short time to help cool the vehicle interior more quickly.
Seat heating
First read and observe the introductoryinformation and safety warnings⇒Introduction
The seat cushions and backrests can be heated electrically when the engine is running.
Operating the seat heating
Press the or button in the air conditioning block in order to switch the seat heating to the
highest temperature setting.
Press the or button repeatedly until the desired setting is reached.
To switch the seat heating off, press the or button repeatedly until no LEDs are lit.
If the ignition is turned on again within approximately 10 minutes, the most recent driver seat
temperature setting is automatically activated.
When should I not switch on the seat heating?
Do not switch on the seat heating if one of the following conditions applies:
The seat is not occupied.
The seat is fitted with a protective cover.
A child seat is installed on the seat.
The seat cushion is damp or wet.
The temperature in the vehicle interior or the outside temperature is above +25°C (77°F).
WARNING
Anyone with reduced sensitivity to pain or temperature due to medication, paralysis or chronic
illness (e.g. diabetes) could sustain burns on the back, buttocks and legs when using the seat
heating. These burns may take a long time to heal or may never heal fully. Please consult a doctor if
you have questions about your own state of health.
Anyone with reduced sensitivity to pain or temperature should never use the seat heating.
WARNING
Wet upholstery can cause a fault in the seat heating and increase the risk of burns.
Ensure that the seat cushion is dry before using the seat heating.
Do not sit on the seat in damp or wet clothing.
Do not place any damp or wet objects or items of clothing on the seat.
Do not spill any liquids on the seat.
NOTICE
To avoid damaging the heating elements, do not kneel on the seats or apply sharp pressure at a
single point to the seat cushion and backrest.
Liquids, sharp objects and insulating materials, such as a protective cover or child seat, may damage
the seat heating.
If the system starts to produce an odour, switch off the seat heating immediately and have it
checked by a qualified workshop.
To save fuel, switch the seat heating off as quickly as possible.
Steering wheel heating
First read and observe the introductoryinformation and safety warnings⇒Introduction
The steering wheel heating works when the engine is running.
Switching the steering wheel heating on and off via the Infotainment system
Manual air conditioning system: press the button on the Infotainment system and
touch the Vehicle and function buttons.
Climatronic: open the air conditioning settings in the Infotainment system.
Touch the function button to switch the steering wheel heating on and off.
Switching the steering wheel heating on or off together with the seat heating (only for Climatronic)
Open the air conditioning settings in the Infotainment system.
Touch the function button.
Touch the Link seat/steering wheel heating function button to link the steering wheel heating with
the seat heating.
Press the button to switch the steering wheel heating on or off together with the seat heating.
Selecting a temperature setting (only for Climatronic)
Open the air conditioning settings in the Infotainment system.
Touch the function button.
Touch the Setting function button to select a temperature setting.
Three temperature settings are available. The selected setting is saved when the ignition is switched
off. The temperature setting for the steering wheel heating is unrelated to the temperature setting
for the seat heating.
Switch-off conditions
The steering wheel heating will be switched off automatically if one of the following conditions is
met:
Seat heating for the driver seat is switched off (if Link seat/steering wheel heating is active).
Power consumption is too high.
There is a fault in the steering wheel heating system.
Troubleshooting
First read and observe the introductoryinformation and safety warnings⇒Introduction
The cooling system cannot be switched on or its function is restricted
The cooling system functions only when the engine is running and at ambient temperatures above
+3°C (+38°F).
The cooling system is switched off when the engine is very warm.
Switch on the blower.
Check the fuse of the air conditioning system ⇒ Fuses in the dash panel .
Change the dust and pollen filter ⇒ Service .
If the fault persists, seek expert assistance.
The heating and fresh air system cannot be switched on or its function is restricted
The heating and defrost function are more effective when the engine is warm.
If the fault persists, seek expert assistance.
Condensation on the windows
Keep the air intake in front of the windscreen free of ice, snow or leaves in order to improve heating
and cooling performance ⇒ Vehicle care .
Do not cover the air vents in the rear of the luggage compartment to allow air to flow through the
vehicle from the front to the rear.
Press the button or turn the rotary knob to position in order to switch on the defrost
function ⇒ .
The wrong unit of temperature is set
Change the unit of temperature for all temperature displays in the vehicle using the Infotainment
system ⇒ Infotainment system controls and displays .
Change the unit of temperature in the instrument cluster menu ⇒ Instrument cluster .
Water under the vehicle
If the humidity and temperature outside the vehicle are high, condensation can drip off the
evaporator of the cooling system and form a pool underneath the vehicle. This is normal and does
not indicate a leak!
If the outside humidity is high and the outside temperature low, condensation may evaporate when
the auxiliary heater is running ⇒ Auxiliary heater and ventilation . If this is the case, steam may
appear underneath the vehicle. This is not a sign that the vehicle is damaged.
WARNING
Poor visibility through all windows increases the risk of collisions and accidents, which can cause
serious injuries.
Always ensure that all windows are free of ice, snow and mist to ensure good visibility.
Maximum heat output and the fastest possible defrosting of the windows are possible only when
the engine is running. Do not start your journey until you have good visibility.
To help ensure good visibility, make sure that you use the air conditioning system and the rear
window heating correctly.
Auxiliary heater and ventilation
Introduction
This chapter contains information on the followingsubjects:
⇒ Switching the auxiliary heater and ventilation on and off
⇒ Programming the auxiliary heater and ventilation
⇒ Remote control
The auxiliary heater and ventilation system can be used to heat the vehicle interior in the winter and
ventilate it in the summer. It is able to clear ice, condensation and a thin layer of snow from the
windscreen. The auxiliary heater is supplied with fuel from the vehicle fuel tank and can be operated
when the vehicle is stationary with the ignition switched off. The auxiliary ventilation system is
powered by the 12-volt vehicle battery.
Auxiliary heater exhaust system
The emissions generated by the auxiliary heater are discharged via an exhaust pipe underneath the
vehicle. The exhaust pipe must not be blocked by snow, mud or other objects.
WARNING
Among other things, the emissions from the auxiliary heater contain carbon monoxide, which is an
odourless and colourless poisonous gas. Carbon monoxide can cause people to lose consciousness. It
can also cause death.
Never switch on the auxiliary heater when the vehicle is in unventilated or closed rooms nor let the
auxiliary heater run in unventilated or closed rooms.
Never program the auxiliary heater so that it is switched on and runs in unventilated or closed
rooms.
WARNING
Parts of the auxiliary heater exhaust system become very hot. This can cause fires.
Park the vehicle so that no part of the exhaust system can come into contact with any inflammable
material underneath the vehicle, e.g. dry grass.
NOTICE
Food, medicine and other items that are sensitive to heat or cold could be either damaged or
rendered useless by the air flowing out of the vents.
Never leave food, medicines or other temperature-sensitive objects in front of the vents.
Switching the auxiliary heater and ventilation on and off
First read and observe the introductoryinformation and safety warnings⇒Introduction
The auxiliary heater can be operated only when the ignition is switched off. If the ignition is switched
on while the auxiliary heater is working, the auxiliary heater continues to run to provide additional
heat.
Switching on the auxiliary heater
Press the immediate heat button in the air conditioning block ⇒ Front controls .
OR: press the button on the remote control ⇒ Remote control .
OR: program the departure time ⇒ Programming the auxiliary heater and ventilation .
The auxiliary heater heats the vehicle interior to at least 22 ℃.
The auxiliary heater will not switch on if the 12-volt vehicle battery is low or the fuel tank is empty.
Switching off the auxiliary heater manually
Press the immediate heat button in the air conditioning block ⇒ Front controls .
OR: press the button on the remote control ⇒ Remote control .
OR: touch the function button on the Infotainment system ⇒ Programming the auxiliary heater
and ventilation .
Auxiliary heater switches off automatically
When the programmed departure time is reached, or after the programmed operating period has
elapsed ⇒ Programming the auxiliary heater and ventilation .
When the indicator lamp lights up (fuel gauge) ⇒ Fuel gauge .
If the charge level of the 12-volt vehicle battery is too low ⇒ 12-volt vehicle battery .
The auxiliary heater runs on for a short time after it has been switched off manually or automatically
so that the remaining fuel in the system can be burnt off.
When the vehicle is at a standstill, the auxiliary heater can be activated up to three times in
succession for the maximum operating duration.
Operating noises can be heard if the auxiliary heater is switched on.
The 12-volt vehicle battery will discharge if the auxiliary heating or ventilation is run several times
over an extended period. Drive the vehicle for an appropriate distance in between in order to
recharge the 12-volt vehicle battery.
The fuel gauge indication may not be accurate (just above the reserve quantity) when the vehicle is
parked on a slope; this may restrict the function of the auxiliary heater.
The auxiliary heater may switch on automatically when the engine is started at temperatures below
+5°C (+41°F) in order to provide additional hea ng power. The supplementary heating function will
switch off again automatically after a short time.
Programming the auxiliary heater and ventilation
First read and observe the introductoryinformation and safety warnings⇒Introduction
Opening the Auxiliary heater menu
The auxiliary heater is programmed in the Infotainment system.
Manual air conditioning system
Press the button on the Infotainment system.
Touch the Vehicle and function buttons.
Climatronic
Open the air conditioning settings in the Infotainment system.
Touch the function button.
Changing operating mode
Open the Auxiliary heater menu.
Press the Heating or Ventilation function buttons to change mode.
At high outside temperatures, the auxiliary ventilation system directs fresh air into the vehicle and
prevents the accumulation of heat.
Programming the auxiliary heater
Activation is always for one heating or ventilation operation only. The departure time must be
activated again for every start.
Before programming, check that the date and time set in the vehicle are correct ⇒ Time .
Open the Auxiliary heater menu.
Touch the Set function button.
Select one of the memory locations for a Departure time.
Touch the Activate function button.
Manual air conditioning system: the programmed departure time determines the time at which
the auxiliary heater or ventilation should switch off. The point at which the heating or ventilation
process starts is determined depending on the programmed running time.
Climatronic: on the basis of the programmed departure time, the vehicle automatically
calculates the start time for heating or ventilation to the currently set temperature depending on
the outside temperature.
Press the Running time function button under Adjust in order to select the running time when the
auxiliary heater is switched on using the immediate heat button or remote control.
Checking programming
If a departure time has been activated, the LED in the immediate heat button will light up on the
Climatronic control panel for approximately 10 seconds after the ignition is switched off.
WARNING
Never program the auxiliary heating system so that is switched on and run in unventilated or
enclosed spaces. Among other things, the emissions from the auxiliary heater contain carbon
monoxide, which is an odourless and colourless poisonous gas. Carbon monoxide can cause people
to lose consciousness. It can also cause death.
Remote control
Fig. 93 Auxiliary heater: remote control (left) with battery compartment (right).
First read and observe the introductoryinformation and safety warnings⇒Introduction