Air conditioning
Overview of air-conditioning systems
The vehicle is equipped
with one of the following air-conditioning systems:
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2-zone
Thermatic
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Multi-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. You can control the air conditioning
separately for the driver's and front-passenger sides.
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Multi-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 settings for the rear
compartment.
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General notes
2-zone Thermatic/multi-zone Thermotronic* controls the temperature and the humidity of the vehicle interior and filters out undesirable substances from the air.
2-zone Thermatic/multi-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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Overview of air-conditioning system functions
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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 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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 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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 Directs the airflow through the demister vents
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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 lights up.
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more
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Switches the residual heat function on/off
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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 temperature, right
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Set the temperature to 22 .
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more
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 Switches the rear-compartment air-conditioning on/off
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more
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 Directs the airflow through the centre and side air vents
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more
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 Directs the airflow to the footwells and side air vents
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more
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Displays the airflow level
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 Reduces the airflow
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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 air-recirculation mode
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Only use this operating mode for a short time, e.g. in a tunnel. Otherwise, the windows could mist up due to lack of fresh air.
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more
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Interior temperature sensor
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 Activates/deactivates Thermatic
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Activate Thermatic. The indicator lamp in the button goes out.
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more
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Multi-zone Thermotronic*
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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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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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 Directs the airflow through the demister vents, left
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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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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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 Directs the airflow through the demister vents, right
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more
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 Operates the rear-compartment air conditioning using multi-zone Thermotronic
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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 multi-zone Thermotronic
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Activate multi-zone Thermotronic. The indicator lamp in the button goes out.
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more
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Directs the airflow to the footwells and side air vents, right
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more
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Directs the airflow through the centre and side air vents, right
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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 lights up.
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more
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Switches the residual heat function on/off
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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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Display
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Reduces the airflow
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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 could mist up due to lack of fresh air.
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more
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 Directs the airflow through the centre and side air vents, left
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more
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 Directs the airflow to the footwells and side air vents, left
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more
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Interior temperature sensor
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 MONO function
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The settings made for the driver's side are adopted in three air-conditioning zones.
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more
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Rear-compartment air conditioning*
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| Increases the airflow |
| Sets the temperature |
| Controls the air conditioning automatically |
| Directs the airflow through the rear air vents |
| Directs the airflow through the footwell vents |
| Activates/deactivates the rear-compartment air conditioning |
| Reduces the airflow |
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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 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. The cooling with air dehumidification function has a delayed switch-off feature.
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Controlling the air conditioning automatically
In automatic mode, the set temperature is maintained automatically at a constant level. 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.
Controlling the front-compartment air conditioning automatically via 2-zone Thermatic/multi-zone Thermotronic*
Controlling the rear-compartment automatic air conditioning* automatically
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Turn the key to position 2 in the ignition lock.
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Activate multi-zone Thermotronic*.
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Set the desired temperature.
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To activate: press the button.
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The indicator lamp in the button comes on. Automatic air distribution and airflow are activated.
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To deactivate: press the or button.
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Automatic airflow is deactivated and the airflow is controlled according to the level set. Automatic air distribution remains activated.
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or |
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Press one of the or buttons.
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Automatic air distribution is deactivated. Air distribution is controlled according to the position set. Automatic airflow remains activated.
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Setting the temperature
2-zone Thermatic: the temperature for the driver's and front-passenger side can be set individually.
Multi-zone Thermotronic*: the temperature for each of the three air-conditioning zones can be adjusted separately. You can select different airflow settings for the driver's and front-passenger sides and also for the rear compartment.
Air-conditioning zones for multi-zone Thermotronic*
Setting the temperature in the front compartment using 2-zone Thermatic
Setting the temperature in the front compartment using multi-zone Thermotronic*
Setting the temperature in the rear compartment using multi-zone Thermotronic*
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Turn the key to position 2 in the ignition lock.
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Press the button.
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The multi-zone Thermotronic* display switches to the settings for the rear-compartment air conditioning.
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To increase/reduce: turn thumbwheel clockwise or anti-clockwise more. Only change the temperature setting in small increments. Start at 22 .
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The set temperature is shown in the multi-zone Thermotronic* display. The multi-zone Thermotronic* display changes back to the standard display about three seconds after a button is pressed.
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Setting the temperature in the rear compartment using the rear-compartment air conditioning*
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
Centre air vents
| Centre air vent, left |
| Centre air vent, right |
| Thumbwheel for centre air vent, right |
| Thumbwheel for centre air vent, left |
Adjusting the side air vents
Side air vents
| Side window demister vent |
| Side air vent |
| Side air vent thumbwheel |
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To open/close: turn thumbwheel to the left or right.
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Setting the rear-compartment air vents
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| Rear-compartment air vent, left |
| Rear-compartment air vent, right |
| Control panel for rear-compartment air conditioning*
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Rear-compartment air conditioning
When the air conditioning control panel is switched on/off, the air supply through the rear-compartment air vents is also switched on/off.
Setting the air distribution
Vehicles with multi-zone Thermotronic*: you can set the air distribution individually for the driver's and front-passenger sides.
2-zone Thermatic/multi-zone Thermotronic*:
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directs the airflow through the demister vents
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directs the airflow through the demister vents
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directs the airflow through the demister vents
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directs the airflow through the footwell and side air vents
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directs the airflow through the footwell and side air vents
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directs the airflow through the centre and side air vents
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directs the airflow through the centre and side air vents
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Rear-compartment air conditioning*:
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directs the airflow through the rear-compartment air vents
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directs the airflow through the footwell air vents
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Switching the Mono function on/off
Multi-zone Thermotronic*: you can use the MONO function to adopt the temperature, air distribution and airflow settings on the driver's side for the front-passenger side.
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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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Demisting the windscreen
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You should only select the "demisting" function until the windscreen is clear again.
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Turn the key to 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 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 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 several minutes.
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If the battery voltage is too low, the rear window heating may switch off.
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Turn the key to position 2 in the ignition lock.
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Press the button.
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The indicator lamp in the button 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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Turn the key to 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.
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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 cooling with 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. Press the button for stopping, opening or closing the side window in the opposite direction as appropriate.
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. Press the button for stopping, opening or closing the sliding/tilting sunroof* in the opposite direction as appropriate.
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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 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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Turn the key to position 0 in the ignition lock or remove it.
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To switch on: 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 residual heat automatically switches off after around 30 minutes or if:
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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 the set temperature 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 switch 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
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Turn the key to position 2 in the ignition lock.
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Set the temperature.
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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 temperature to 22 .
The auxiliary heating/ventilation can be activated or deactivated using 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.
Switching the auxiliary heating/ventilation on/off using the centre console button
Centre console
|  Auxiliary heating/ventilation |
The colours of the indicator lights on the button have the following meanings:
| Blue |
Auxiliary ventilation activated
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| Red |
Auxiliary heating activated
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| Yellow |
Departure time preselected more
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Activating the auxiliary heating/ventilation
If the key is in position 1 or 2:
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Press and hold the 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 the 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 the button.
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The red or blue indicator lamp in the button goes out.
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Switching the auxiliary heating/ventilation on/off using the 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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Auxiliary heating remote control
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/ventilation function selected by the system is not available. The vehicle 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:
symbol. The 