Air conditioning
Overview of the control panels
The vehicle is equipped with one of the following air-conditioning systems:
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2-zone Thermatic
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4-zone Thermotronic*
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Rear-compartment air conditioning*
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2-zone Thermatic is an automatic air-conditioning system combining an automatic heating and ventilation system with a cooling system.
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4-zone Thermotronic is a luxury automatic air-conditioning system combining an automatic heating and ventilation system with a cooling system. You can control the air conditioning separately for each zone in the vehicle.
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The rear-compartment air conditioning allows separate temperature settings for the rear compartment.
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General notes
2-zone Thermatic controls the temperature of the vehicle interior and filters out undesirable substances from the air.
4-zone Thermotronic* controls the temperature and the humidity of the vehicle interior and filters out undesirable substances from the air.
2-zone Thermatic/4-zone Thermotronic* is only operational when the engine is running. Optimum operation is only achieved when you drive with the side windows and sliding/tilting 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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Control panels for Thermatic/4-zone Thermotronic*/rear-compartment air-conditioning*
2-zone Thermatic
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Function
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Recommendation/Notes
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Sets the temperature, left
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Set the temperature to 22  .
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more
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 Demists 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 airflow
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more
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Display
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 Sets the air distribution
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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 temperature, right
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Set the temperature to 22 .
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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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 Activates/deactivates cooling with air dehumidification
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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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 Sets the air distribution
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more
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 Activates/deactivates Thermatic
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Activate Thermatic. The display comes on.
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more
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 Reduces the airflow
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more
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 Activates/deactivates Thermatic
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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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 Controls the air conditioning automatically
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Activate automatic air conditioning. AUTO appears in the display.
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more
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4-zone Thermotronic*
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Function
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Recommendation/Notes
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Sets the air distribution, left
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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-hand side
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Set the temperature to 22 .
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more
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Display
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Increases the temperature, right-hand side
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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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Sets the air distribution, right
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more
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Controls the air-conditioning system automatically, right
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Activate the automatic air conditioning. The indicator lamp in the button comes on.
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more
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Cooling 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-hand side
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Set the temperature to 22 .
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more
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 Operates the rear-compartment air conditioning via 4-zone Thermotronic
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more
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Increases the airflow
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more
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Activates/deactivates 4-zone Thermotronic
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Activate 4-zone Thermotronic. The display comes on.
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more
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Reduces the airflow
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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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Reduces the temperature, left-hand side
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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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Controls the air-conditioning system automatically, left
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Activate the automatic air conditioning. The indicator lamp in the button comes on.
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more
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Rear-compartment air conditioning*
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| To increase the temperature, left |
| Display |
| To increase the temperature, right |
| To reduce the temperature, right |
| To reduce the temperature, left |
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Activating/deactivating the control panel
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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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To activate: press the button.
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The display comes on. The previously selected settings come into effect again.
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To deactivate: press the button.
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The display shows
0
/OFF
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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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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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The cooling with air dehumidification function in the rear compartment is only operative if the 4-zone Thermotronic cooling with air dehumidification function* is switched on.
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Controlling the air conditioning automatically
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
Original Element p durch Gültigkeiten gefiltert!
2-zone Thermatic
Different temperatures can be set for the driver's and front-passenger sides.
4-zone Thermotronic*
The interior temperature for each of the four air-conditioning zones can be adjusted separately.
The air-conditioning zones of 4-zone Thermotronic*
Front air-conditioning zones
Rear air-conditioning zones
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Press the button.
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The 4-zone Thermotronic* display switches to the rear-compartment air conditioning settings.
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To increase/reduce: press the or button. Only change the temperature setting in small increments. Start at 22 .
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The set temperature is shown in the 4-zone Thermotronic* display. The 4-zone Thermotronic* display changes back to the standard display about five seconds after a button is pressed.
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You can also return to the standard display by pressing the button again.
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Rear-compartment air conditioning*
Different temperatures can be set for the left and right sides of the rear compartment.
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
Setting 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 to the left or right.
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Setting the stowage compartment air vent
The stowage compartment can be ventilated, for instance to cool its contents, when 2-zone Thermatic/4-zone Thermotronic* is activated. The level of airflow to the stowage 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 stowage 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 stowage compartment could be damaged.
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| Slide |
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Stowage compartment air vent
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 vent, right |
| Control panel for rear-compartment air conditioning*
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| Thumbwheel for rear-compartment air vent, left |
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Rear-compartment air conditioning
Original Element p durch Gültigkeiten gefiltert!
Setting the air distribution
2-zone Thermatic
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 to the entire vehicle interior
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Directs the airflow through the demister vents to the windscreen and side windows and through the centre and side air vents
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Directs the airflow through the demister vents to the windscreen and side windows
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Directs the airflow through the demister vents to the windscreen and side windows and to the front and rear footwells
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Directs the airflow through the centre and side air vents
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Directs the airflow to the front and rear footwells
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Directs the airflow to the centre and side air vents and to the front and rear footwells
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4-zone Thermotronic*
The air distribution can be adjusted individually for the driver's and front-passenger sides.
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 centre, side and demister vents to the windscreen and side windows
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Directs the airflow through the centre and side air vents
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Directs the airflow to the entire vehicle interior
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Directs the airflow to the centre and side air vents and to the front and rear footwells
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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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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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Windows misted up
Windows misted up on the inside
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Activate the "cooling function with air-dehumidification" function.
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Activate the automatic mode.
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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 yourself 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 itself off automatically after between six and twenty minutes.
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If the battery voltage is too low, the rear window heating may switch off.
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Make sure that the key is in position 2 in the ignition lock.
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Press the button.
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The indicator lamp in the switch lights up or goes out.
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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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To activate: press the button.
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The indicator lamp in the button comes on.
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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 5
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after approximately five minutes if the air dehumidification is deactivated
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after approximately 30 minutes at outside temperatures above approximately 5
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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 when you are opening or closing the sliding/tilting sunroof*. If there is a risk of entrapment, press the button again. If necessary, press the switch to stop, open or close the sliding/tilting sunroof* in the opposite direction.
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Convenience closing: press and hold the button until the side windows and the sliding/tilting sunroof* have closed.
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The indicator lamp in the button comes on. Air-recirculation mode is activated.
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Convenience opening: press and hold the button until the side windows and the sliding/tilting sunroof* have reached their original position.
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The indicator lamp in the button goes out. Air-recirculation mode is deactivated.
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If you open the side windows or the sliding/tilting 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
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 switch on: press the button.
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REST appears in the display.
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To deactivate: press the button.
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REST is no longer shown in the display.
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The auxiliary heating/ventilation is automatically deactivated after about 30 minutes, or when:
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Auxiliary heating/ventilation*
| Risk of poisoning |
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Exhaust fumes are produced when the auxiliary heating is in operation. Inhaling these exhaust fumes can be poisonous. You should therefore switch off the auxiliary heating in confined spaces without an extraction system, e.g. a garage.
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| Risk of fire |
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When operating the auxiliary heating, parts of the vehicle may become very hot, and highly inflammable material such as fuels could be ignited. Operating the auxiliary heating is thus prohibited at filling stations or when your vehicle is being refuelled. You must therefore switch off the auxiliary heating at filling stations.
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The auxiliary heating heats the air in the vehicle interior to a temperature between 20 °C and 24 °C without using the heat of the running engine. The auxiliary heating is operated using fuel directly from the vehicle's fuel tank. For this reason, the tank content must be at least at reserve fuel level to ensure that the auxiliary heating functions.
The auxiliary heating/ventilation automatically adjusts to changes in temperature and weather conditions. For this reason, the auxiliary heating could automatically switch over from ventilation mode to heating mode or from heating mode to ventilation mode.
You cannot use the auxiliary ventilation to cool the vehicle interior to a temperature lower than the outside temperature.
Before activating
The auxiliary heating/ventilation can be activated even when the air conditioning is being controlled manually. Optimum comfort can be attained when the system is set to automatic mode. Set the desired temperature within this range. If a higher temperature is set, the vehicle is heated to 24 . If a lower temperature is set, the vehicle is heated to 20 .
Activating or deactivating the auxiliary heating/ventilation
The auxiliary heating/ventilation can be activated or deactivated via the remote control or the button on the centre console.
The on-board computer can be used to specify up to three departure times, one of which may be preselected more.
Button on the centre console
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| Button for auxiliary heating/ventilation |
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The indicator lamps in the button may light up in blue, red or yellow.
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Blue: auxiliary ventilation activated
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Red: auxiliary heating activated
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Yellow: departure time preselected
Activating the auxiliary heating/ventilation
If the key is in position 1 or 2:
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Press and hold button for at least two seconds.
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The red or blue indicator lamp in the button lights up.
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If the key is removed or in position 0:
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Briefly press button .
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The red or blue indicator lamp in the button lights up.
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Deactivating the auxiliary heating/ventilation
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Briefly press button .
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The red or blue indicator lamp in the button goes out.
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Remote control
Your vehicle comes with one remote control. You may use two additional remote controls for your vehicle. For further information, consult a qualified specialist workshop, e.g. a Mercedes-Benz Service Centre.
The remote control has a maximum range of approximately 300 metres. This range may be reduced by:
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sources of radio interference
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solid objects between the remote control and the vehicle
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the remote control being in an unfavourable position in relation to the vehicle
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transmitting from an enclosed space
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The optimum range can be achieved if you hold the remote control vertically, pointing upwards when you press one of the buttons.
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A battery symbol appears in the display when the batteries in the remote control are low. Replace the remote control batteries more.
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More information about the auxiliary heating can be found in the "Practical advice" section more.
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| Display |
| To check the status |
| OFF to deactivate auxiliary heating/ventilation |
| ON to activate auxiliary heating/ventilation |
| To check the status |
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Using the remote control, you can:
Activating the auxiliary heating/ventilation
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Press the ON button.
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The following messages can appear in the display:
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Display
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Meaning
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The auxiliary heating/ventilation is activated.
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A malfunction has occurred in the auxiliary heating/ventilation. The heating or ventilation function selected by the system is not available. The battery is not charged sufficiently or the system is faulty.
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The signal transmission between the transmitter and the vehicle is faulty.
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The heating system has a fault or there is insufficient fuel in the fuel tank. The auxiliary heating is not working. The auxiliary ventilation is still functioning.
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Deactivating the auxiliary heating/ventilation
The auxiliary heating switches off automatically after 50 minutes.
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This time limit can be altered. To do this, visit a qualified specialist workshop, e.g. a Mercedes-Benz Service Centre.
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Press the OFF button.
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The following messages can appear in the display:
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Display
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Meaning
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The auxiliary heating/ventilation is deactivated.
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The signal transmission between the transmitter and the vehicle is faulty.
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Checking the status of the auxiliary heating
The following messages can appear in the display:
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Display
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Meaning
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The auxiliary heating/ventilation is deactivated.
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A malfunction has occurred in the auxiliary heating/ventilation. The heating or ventilation function selected by the system is not available. The battery is not charged sufficiently or the system is faulty.
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The signal transmission between the transmitter and the vehicle is faulty.
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The auxiliary ventilation is switched on. The number in the remote control display indicates the remaining operating time of the auxiliary ventilation.
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The auxiliary heating is switched on. The number in the remote control display indicates the remaining operating time of the auxiliary heating.
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or 
button.