Air conditioning
General notes
The automatic air conditioning controls the temperature and the humidity of the vehicle interior and filters out undesirable substances from the air.
Automatic air conditioning 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
Automatic air conditioning
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Function
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Recommendation/Notes
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 Controls the air conditioning automatically, left
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Activate automatic air conditioning. The indicator lamp in the rocker switch comes on.
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more
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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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 Sets the airflow, 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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 Activates/deactivates Thermatic
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Only use this mode briefly when unpleasant odours are entering the vehicle from outside. Otherwise, the windows can mist up due to lack of fresh air.
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more
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 Activates/deactivates automatic air conditioning
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Activate automatic air conditioning. The indicator lamp in the rocker switch goes out.
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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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 Activates/deactivates auxiliary heating*
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more
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 Switches the rear window heating on/off
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At 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 airflow, right
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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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Controls the air conditioning automatically, right
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Activate automatic air conditioning. The indicator lamp in the rocker switch comes on.
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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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Activate the air conditioning primarily using the rocker switch.
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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 rocker switch up or down.
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The indicator lamp in the rocker switch goes out. The previously selected settings come into effect again.
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To deactivate: press the rocker switch up or down.
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The indicator lamp in the rocker switch 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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You can activate or deactivate the "cooling with air
dehumidification" function via COMAND
more.
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.
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Make sure that the key is in position 2 in the ignition lock.
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Set the desired temperature.
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To activate: press the rocker switch up or down.
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The indicator lamp in the rocker switch comes on.
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To deactivate: press the rocker switch up or down.
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The indicator lamp in the rocker switch goes out.
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Press the rocker switch up or down.
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The indicator lamp in the rocker switch goes out.
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or |
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Adjust the air distribution using COMAND more.
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The indicator lamp in the rocker switch goes out.
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Setting the temperature
Automatic air conditioning zones
The temperature for each of the three air conditioning zones can be adjusted separately. You can select different temperature settings for the driver's and front-passenger sides and also for the footwells.
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The footwell temperature can be adjusted via COMAND more.
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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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| Fixed centre air vent |
| Centre air vent, right |
| Thumbwheel for centre air vent, right |
| Thumbwheel for centre air vent, left |
| 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 stowage compartment air vent
The stowage compartment can be ventilated, for instance to cool its contents, when the automatic air conditioning system is activated. The level of airflow 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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| To deactivate |
| To activate |
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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 |
| Thumbwheel for rear-compartment air vent, left |
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Rear-compartment air vents
Original Element p durch Gültigkeiten gefiltert!
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Close the rear-compartment air vents when heating mode is activated as no warm air flows through the rear-compartment air vents in the basic heating setting.
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Setting the air distribution
The
air distribution can be adjusted using COMAND
more.
Setting the airflow
You can select different airflow settings for the driver's and front-passenger sides.
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Make sure that the key is in position 2 in the ignition lock.
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To increase/reduce: press the rocker switch up or down.
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You can also use COMAND Sets the airflow more.
Demisting the windscreen
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You should only select the "demisting" function until the windscreen is clear again.
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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 rocker switch up or down.
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The indicator lamp in the rocker switch 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
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Activate the
windscreen wipers.
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Activate the
automatic air conditioning.
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You should only
select this setting until the windscreen is clear
again.
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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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Make sure that the
key is in position 2 in the ignition lock.
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Press the
rocker switch
up or down.
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The indicator lamp
in the rocker
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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Make sure that the
key is in position 2 in the ignition lock.
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To activate:
press the
rocker switch up or down.
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The indicator lamp
in the rocker
switch comes on.
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Air-recirculation mode is activated automatically at high outside
temperatures. The indicator lamp in the
rocker switch
goes off when automatic air-recirculation mode is activated.
Outside air is
added after about 30 minutes.
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To deactivate:
press the
rocker switch up or down.
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The indicator lamp
in the rocker
switch 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 that stops, opens or closes the sliding/tilting sunroof in the opposite direction.
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Convenience
closing: press and hold the
rocker switch up
or down until the sliding/tilting sunroof and side windows have
closed.
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The indicator lamp
in the rocker
switch comes on. Air-recirculation mode is
activated.
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Convenience
opening: press and hold the
rocker switch up
or down until the sliding/tilting sunroof and the side windows have reached
their original position.
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The indicator lamp
in the rocker
switch 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 and 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
rocker switch up or down.
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The indicator lamp
in the rocker
switch lights up.
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To switch off:
press the
rocker switch up or down.
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The indicator lamp
in the rocker
switch 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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Make sure that the key is in 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 .
Activating/deactivating the auxiliary heating/ventilation
The auxiliary heating/ventilation can be activated or deactivated using the remote control or the rocker switch on the centre console.
You can use COMAND more or the remote control to specify up to three departure times, one of which may be preselected.
Rocker switch on the centre console
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| Auxiliary heating/ventilation |
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Automatic air conditioning
The indicator lamps in rocker switch 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 more
Activating the auxiliary heating/ventilation
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Press rocker switch up or down.
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The red or the blue indicator lamp in rocker switch lights up.
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Deactivating the auxiliary heating/ventilation
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Press rocker switch up or down.
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The red or the blue indicator lamp in rocker switch 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/set the departure time |
| OFF - to deactivate auxiliary heating/ventilation |
| ON - to activate auxiliary heating/ventilation |
| To check the status/set the departure time |
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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:
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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/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 auxiliary ventilation is switched on. The number in the display shows the remaining time (in minutes) for the auxiliary ventilation.
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The auxiliary heating is switched on. The number in the display shows the remaining time (in minutes) for the auxiliary heating.
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A departure time has been activated. The departure time appears in the display.
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A departure time has been activated. The auxiliary ventilation is currently selected. The departure time appears in the display.
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A departure time has been activated. The auxiliary heating is currently selected. The departure time appears in the display.
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Setting a departure time
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Press the ON and OFF buttons simultaneously.
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The new departure time is stored.
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Activating a set departure time
Deactivating a set departure time
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Press the  or  button.
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The status of the auxiliary heating is shown in the display.
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Press the or button.
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The desired active departure time appears in the display.
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Press the OFF button.
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The display message OFF appears in the display.
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Activating/deactivating the heater booster function*
The heater booster function helps the engine to reach its operating temperature faster during its warm-up phase, as well as helping to heat the vehicle interior faster. The heater booster function switches on when outside temperatures are low and the coolant temperature is less than 70 . You can also activate the heater booster manually.
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| Auxiliary heating/ventilation* |
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Automatic air conditioning
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To ensure that the heater booster functions properly, the fuel level in the tank must be at least at the reserve fuel level.
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Make sure that the engine is running.
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To switch on: briefly press rocker switch up or down.
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Red indicator lamp in rocker switch lights up.
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To switch off: briefly press rocker switch up or down.
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Red indicator lamp in rocker switch goes out.
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symbol in the remote control display flashes.
symbol and the departure time appear in the display.