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Air conditioning
Overview of air-conditioning systems
The vehicle is equipped with one of the following air-conditioning systems:
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Heatmatic
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Air-conditioning system*
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Thermotronic*
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Heatmatic is a heating and ventilation system without a cooling system.
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The air-conditioning combines a heating and ventilation system with a cooling system.
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The Thermotronic automatic air-conditioning system combines an automatic heating and ventilation system with a cooling system. You can control the air conditioning separately for the driver's and front-passenger sides.
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General notes
The air-conditioning system*/Thermotronic* controls the temperature and the humidity of the vehicle interior and filters out undesirable substances from the air.
Heatmatic/the air-conditioning system*/Thermotronic* is only operational when the engine is running. Optimum operation is only achieved when you drive with the side windows and panorama louvred sliding sunroof* closed.
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Ventilate the vehicle for a brief period during warm weather, e.g. using the summer opening feature more. This will speed up the cooling process and the desired interior temperature will be reached more quickly.
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The integrated filter filters out most particles of dust and completely filters out pollen. A clogged filter reduces the amount of air supplied to the vehicle interior. For this reason, you should always observe the interval for replacing the filter, which is specified in the Service Booklet. As it depends on environmental conditions, e.g. heavy air pollution, the interval may be shorter than stated in the Service Booklet.
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 | Risk of accident |
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Observe the settings recommended on the following pages. The windows could otherwise mist up. This may obstruct your view of the traffic situation, thereby causing an accident.
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Overview of air-conditioning system functions
Heatmatic
Heatmatic is not available in certain countries.
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Function
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Recommendation/Notes
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Sets the temperature
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more
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Activates/deactivates the demisting function for the windscreen
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Only use the "demisting" function until the windscreen is clear again.
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more
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Activates/deactivates air-recirculation mode
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Only use this operating mode for a short time, e.g. in a tunnel. Otherwise, the windows can mist up due to lack of fresh air.
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more
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Sets the airflow
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more
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Activates/deactivates the demisting function for the windscreen
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Only use the "demisting" function until the windscreen is clear again.
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more
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Switches the rear window heating on/off
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At very low temperatures, the rear window heating is only switched on once the vehicle interior has warmed up.
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more
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Sets the air distribution
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more
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Activates/deactivates the demisting function for the windscreen
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Only use the "demisting" function until the windscreen is clear again.
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more
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Air-conditioning system*
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Function
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Recommendation/Notes
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Sets the temperature
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Set the temperature to 22 .
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more
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Activates/deactivates the demisting function for the windscreen
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Only use the "demisting" function until the windscreen is clear again.
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more
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Activates/deactivates air-recirculation mode
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Only use this operating mode for a short time, e.g. in a tunnel. Otherwise, the windows can mist up due to lack of fresh air.
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more
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Sets the airflow
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more
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Activates/deactivates the demisting function for the windscreen
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Only use the "demisting" function until the windscreen is clear again.
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more
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Switches the rear window heating on/off
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At very low temperatures, the rear window heating is only switched on once the vehicle interior has warmed up.
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more
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Sets the air distribution
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more
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Activates/deactivates the demisting function for the windscreen
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Only use the "demisting" function until the windscreen is clear again.
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more
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Switches air conditioning with air dehumidification on/off
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Switch on the air conditioning with air dehumidification function. The indicator lamp in the button comes on.
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more
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Thermotronic*
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Function
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Recommendation/Notes
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Sets the airflow
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more
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Controls the air conditioning automatically
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Activate automatic air conditioning. The indicator lamp in the button comes on.
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more
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Activates/deactivates the demisting function for the windscreen
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Only use the "demisting" function until the windscreen is clear again.
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more
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Increases the temperature, left
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Set the temperature to 22 .
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more
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Activates/deactivates Thermotronic
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Activate Thermotronic. The indicator lamp in the button goes out.
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more
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Increases the temperature, right
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Set the temperature to 22 .
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more
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Switches the rear window heating on/off
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At very low temperatures, the rear window heating is only switched on once the vehicle interior has warmed up.
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more
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Activates/deactivates the auxiliary heating/ventilation
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You can use the residual heat to heat or ventilate the vehicle interior after you have switched off the ignition.
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more
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Sets the air distribution
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more
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Switches air conditioning with air dehumidification on/off
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Switch on the air conditioning with air dehumidification function. The indicator lamp in the button comes on.
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more
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Reduces the temperature, right
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Set the temperature to 22 .
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more
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Display
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Reduces the temperature, left
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Set the temperature to 22 .
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more
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Activates/deactivates air-recirculation mode
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Only use this operating mode for a short time, e.g. in a tunnel. Otherwise, the windows can mist up due to lack of fresh air.
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more
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Switching the air conditioning on/off
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When the air
conditioning is switched off, the air supply and air circulation are also
switched off. Only select this setting briefly, otherwise the windows may mist
up.
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Heatmatic/air-conditioning
system*
Thermotronic*
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Make sure that the
key is in position 2 in the ignition lock.
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To
activate: press the button.
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The indicator lamp
in the button
goes out. The previously selected settings come into effect
again.
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Press the
button.
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The indicator lamp
in the button
comes on. Airflow and air distribution are set to automatic
mode.
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To deactivate:
press the button.
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The indicator lamp
in the button
comes on.
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Switching cooling with air-dehumidification on/off
The "cooling with
dehumidification" function is only available when the engine is running. The
air inside the vehicle is cooled and dehumidified according to the temperature
selected. This prevents the windows from misting up.
 | Risk of accident |
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If the "cooling with air dehumidification" function is deactivated, the air inside the vehicle will not be cooled (during warm weather) or dehumidified. The windows could mist up more quickly. This may prevent you from observing the traffic conditions, thereby causing an accident.
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 | Environmental note |
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The cooling system uses the refrigerant R134A. This refrigerant does not damage the earth's ozone layer.
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Condensation may
drip from the underside of the vehicle when Thermatic is in cooling
mode.
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The "cooling with air dehumidification" function is only
available with air conditioning* or Thermotronic*.
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To switch
on: press the button.
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The indicator lamp
in the button
comes on.
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To deactivate:
press the button.
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The indicator lamp
in the button
goes out. The cooling with air dehumidification function has a delayed
switch-off feature.
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Controlling the air conditioning automatically
Only Thermotronic* features the "control air conditioning automatically" function.
In automatic mode, the set temperature is maintained at a constant level fully automatically. To do so, the system automatically regulates the temperature of the dispensed air, the airflow and the air distribution.
The automatic air conditioning will achieve optimal operation if "cooling with air dehumidification" is also activated. If necessary, cooling with air dehumidification can be deactivated.
Setting the temperature
Heatmatic/air-conditioning system*
You can set the temperature for the entire vehicle.
Thermotronic*
Different temperatures can be set for the driver's and front-passenger sides.
Adjusting the air vents
 | Risk of injury |
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Very hot or very cold air can flow from the air vents. This could cause burns or frostbite to bare skin in the immediate vicinity of the vents. Keep bare skin away from these air outlets. If necessary, direct the airflow away to a different area of the vehicle interior.
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Please observe the following notes to ensure that the air can flow freely through the air vents:
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Keep the air inlet between the windscreen and the bonnet free of deposits, such as ice and snow, to guarantee the supply of fresh air into the vehicle interior.
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Never cover the vents or air inlet and outlet grilles in the vehicle interior.
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Position the sliders for the centre air vents in the central position to provide virtually draught-free ventilation.
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Setting the centre air vents
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 | Centre air vent, left |
 | Centre air vent, right |
 | Thumbwheel for centre air vent, right |
 | Thumbwheel for centre air vent, left |
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Centre air vents
Adjusting the side air vents
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 | Side window demister vent |
 | Side air vent |
 | Side air vent thumbwheel |
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Side air vents
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To open/close: turn thumbwheel up or down.
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Setting the glove compartment air vent*
The glove compartment can be ventilated, for instance to cool its contents, when the air conditioning*/Thermotronic* is activated. The level of airflow to the glove compartment depends on the airflow and air distribution settings. The temperature of the air is approximately the same as that of the air flowing from the centre air vents.
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Close the glove compartment air vent when heating mode is activated and activate "cooling with air dehumidification" if the outside temperature is high. Otherwise, temperature-sensitive items stored in the glove compartment could be damaged.
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 | Air vent thumbwheel |
 | Air vent |
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Glove compartment air vent
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To open/close: turn thumbwheel clockwise or anti-clockwise.
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Setting the rear-compartment air vents
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 | Rear-compartment air vent, left |
 | Rear-compartment air vent, right |
 | Thumbwheel for rear-compartment air vents |
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Rear-compartment air vents
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To open/close: turn thumbwheel to the left or right.
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Original Element p durch Gültigkeiten gefiltert!
Setting the air distribution
The symbols for the air distribution have the following meanings:
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Symbol
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Meaning
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Directs the airflow through the demister vents to the windscreen and side windows
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Directs the airflow to the entire vehicle interior
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Directs the airflow to the footwell and through the side air vents
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Directs the airflow through the centre and side air vents
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Heatmatic/air-conditioning system*
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Make sure that the key is in position 2 in the ignition lock.
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Turn thumbwheel to the corresponding symbol more, more. The thumbwheel can also be turned to the area between two symbols.
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Thermotronic*
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Make sure that the key is in position 2 in the ignition lock.
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Turn thumbwheel to the corresponding symbol more. The thumbwheel can also be turned to the area between two symbols.
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Setting the airflow
Heatmatic/air-conditioning system*
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Make sure that the key is in position 2 in the ignition lock.
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To increase/reduce: turn thumbwheel clockwise or anti-clockwise more, more.
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Thermotronic*
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Make sure that the key is in position 2 in the ignition lock.
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To increase/reduce: turn thumbwheel clockwise or anti-clockwise more.
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Demisting the windscreen
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You should only select the "demisting" function until the windscreen is clear again.
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Heatmatic/air-conditioning system*
Thermotronic*
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Make sure that the key is in position 2 in the ignition lock.
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To activate: press the button.
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The indicator lamp in the button comes on.
The system automatically switches to the following functions:
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cooling with air dehumidification on
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high airflow
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high temperature
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air distribution to the windscreen and front side windows
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air-recirculation mode off
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Demisting the windows
Windows misted
up on the inside
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Activate the "cooling with air-dehumidification"
function .
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Activate the automatic air conditioning .
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If the windows
continue to mist up, activate the "demisting"
function.
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Windows misted
up on the outside
Switching the rear window heating on/off
 | Risk of accident |
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Clear all windows of ice or snow before setting off. Impaired visibility could otherwise endanger you and others.
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At very low temperatures, the rear window heating is only switched on once the vehicle interior has warmed up.
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The rear window heating has a high current draw. You should therefore switch it off as soon as the window is clear, as it only switches off automatically after between six and seventeen minutes.
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If the battery voltage is too low, the rear window heating may switch off.
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Activating/deactivating air-recirculation mode
You can deactivate
the flow of fresh air if unpleasant odours are entering the vehicle from
outside. The air already inside the vehicle will then be recirculated.
 | Risk of accident |
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Only switch over to air-recirculation mode briefly at low outside temperatures. Otherwise, the windows could mist up, thus impairing visibility and endangering yourself and others. This may prevent you from observing the traffic conditions, thereby causing an accident.
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Make sure that the
key is in position 2 in the ignition lock.
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To
activate: press the button.
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The indicator lamp
in the button
lights up.
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Air-recirculation mode is activated automatically at high outside
temperatures. When air-recirculation mode is activated automatically, the
indicator lamp in the button is not lit.
Outside air is
added after about 30 minutes.
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To deactivate:
press the button.
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The indicator lamp
in the button
goes out.
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Air-recirculation mode
switches off automatically:
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after approximately
five minutes at outside temperatures below approximately 7 
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after approximately
5 minutes if cooling with air dehumidification is switched off
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after approximately
30 minutes at outside temperatures above approximately 7

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Air-recirculation mode with the
convenience opening/closing feature
 | Risk of injury |
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Make sure that nobody can become trapped between the side window and the door frame as the side windows are opened and closed. Do not place objects or lean against the side window when it is being opened or closed. You or the objects could be drawn in or become trapped between the side window and the door frame as the window moves. If there is a risk of entrapment, press the button again. If necessary, press the switch that stops, opens or closes the side window in the opposite direction.
Make sure that nobody can become trapped as the panorama louvred sliding sunroof* is opened and closed. If there is a risk of entrapment, press the button again. If necessary, press the switch to stop, open or close the panorama louvred sliding sunroof* in the opposite direction.
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Convenience
closing: press and hold the button until the side windows and the panorama
louvred sliding sunroof* have
closed.
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The indicator lamp
in the button
lights up. Air-recirculation mode is activated.
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Convenience
opening: press and hold the
button until the
side windows have returned to their original position.
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The indicator lamp
in the button
goes out. Air-recirculation mode is deactivated. The panorama louvred sliding
sunroof* moves to the
ventilation position.
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If you open a side
window or the panorama louvred sliding sunroof* manually after closing using the
convenience closing feature, it will remain in this position when opened using
the convenience opening feature.
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Switching the residual heat/auxiliary ventilation on/off
The residual heat/auxiliary ventilation function is only available in vehicles featuring Thermotronic*.
It is possible to make use of the residual heat of the engine to continue heating the stationary vehicle for up to 30 minutes after the engine has been switched off. The heating time depends on the set interior temperature.
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The blower will run at a low speed regardless of the airflow setting.
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If you activate the "residual heat" function at high temperatures, only the ventilation will be activated. The blower runs at medium speed.
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Make sure that the key is in position 0 in the ignition lock or that it has been removed.
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To activate: press the button.
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The indicator lamp in the button lights up.
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To deactivate: press the button.
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The indicator lamp in the button goes out.
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The auxiliary heating/ventilation is automatically deactivated after about 30 minutes, or when:
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