Air conditioning
Ventilation and heating
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 | Air-conditioning switch |
 | Air-recirculation switch |
 | Temperature selector |
 | Air-distribution switch for the windows |
 | Air-distribution switch for the vehicle interior |
 | Blower switch |
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Air-conditioning system control panel
The air-conditioning system control panel can be used to regulate the:
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airflow
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air distribution
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temperature
Adjusting the airflow
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Turn the vehicle key to the radio position in the ignition lock.
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Airflow control settings
| 1-2 |
Heating/ventilation/cooling
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For precise control of the selected temperature, select blower speed setting 1 or 2.
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Selecting the temperature
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| Heating off |
| Full heater output |
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Operate the temperature selector at least once or twice every month.
This will ensure its operational reliability.
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Use the temperature selector to set the desired temperature.
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On vehicles with auxiliary heating: set the temperature selector to position .
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Example settings
Demisting the windscreen
Set the switches to the positions shown and also:
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Close the air vents and the heating vents.
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The full heater output is only available when the engine has reached operating temperature. If required, switch on the auxiliary heating more.
Heating
Set the switches to the positions shown and also:
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Open the air vents and the heating vents as desired.
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If required, switch on the auxiliary heating more.
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Ventilation
Set the switches to the positions shown and also:
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Open the roof hatch.
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Open the air vents and the heating vents as desired.
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Unpleasant odours
 | Risk of accident |
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Only switch over to air-recirculation mode briefly if the outside temperature is low. Otherwise, the windows could mist up, thus impairing visibility and endangering you and others. This may prevent you from observing the traffic conditions, thereby causing an accident.
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Original Element p durch Gültigkeiten gefiltert!
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Close the side windows and the roof hatch.
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Press the lower section of the air-recirculation switch (recirculated air).
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The blower is set from fresh air to recirculated air. The indicator lamp in the switch lights up.
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Press the upper section of the air-recirculation switch as soon as possible to set the blower back to fresh air again. This will prevent the windows from misting up.
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The blower is set from recirculated air to fresh air. The indicator lamp in the switch goes out.
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Air conditioning system
The air-conditioning system cannot be operated unless the engine is running.
At very high outside temperatures, switch on air-recirculation mode more.
Air-conditioning switch
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Switch on the air-conditioning system at least once a month for approx. 10 minutes to prevent damage to the air-conditioning compressor.
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To switch on the air conditioning: press the bottom of the air conditioning switch.
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The indicator lamp in the switch lights up.
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To switch off the air conditioning: press the top of the air conditioning switch.
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The indicator lamp in the switch goes out.
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To set the temperature: turn the temperature selector to the desired temperature.
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Example settings
Cooling
Set the switches to the positions shown and also:
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Close the roof hatch.
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Open the air vents and the heating vents as desired.
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Dehumidifying
Set the switches to the positions shown and also:
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Close the roof hatch.
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Close the air vents and the heating vents.
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Auxiliary heating
| Risk of injury |
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Running the auxiliary heating leads to the emission of hot and toxic exhaust gases.
You should therefore switch off the auxiliary heating in enclosed spaces without an extraction system, e.g. a garage.
Operation of the auxiliary heating system is prohibited at filling stations or when refuelling your vehicle.
The fuel vapours created during refuelling can ignite upon contact with the auxiliary heating's exhaust system. You must therefore switch off the auxiliary heating at filling stations.
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If the auxiliary heating is not used for a long period of time, e.g. in summer, deposits can form in the fuel system of the auxiliary heating due to exposure to heat and condensation. These deposits can cause malfunctions to the auxiliary heating. Therefore, have the auxiliary heating checked and repaired at a qualified specialist workshop which has the necessary specialist knowledge and tools to carry out the work required before operating it again. Mercedes-Benz recommends that you use a Mercedes-Benz Service Centre for this purpose.
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Switch on the auxiliary heating at least once a month for approx. 10 minutes to avoid damage to the circulation pump.
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The auxiliary heating can only be operated with commercially available diesel fuel. Operating it with FAME fuel (bio-diesel fuel) or a mixture of commercially available diesel fuel and FAME fuel (> 10% quantity to be added) can lead to malfunctions and is therefore not permitted.
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If the vehicle is operated with FAME fuel (bio-diesel fuel) or a mixture of commercially available diesel fuel and FAME fuel (> 10% quantity to be added) or with natural gas:
An additional fuel tank with commercially available diesel fuel is needed to operate the auxiliary heating.
The auxiliary heating can be operated with or without the engine running. The maximum heating time when stationary is 120 minutes, if the vehicle key is turned all the way back in the ignition lock. There is no limit to the heating time while driving.
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If you want to keep the auxiliary heating running permanently, e.g. overnight, turn the vehicle key to the radio position more in the ignition lock.
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The auxiliary heating heats the coolant and the vehicle interior, therefore reducing the load on the engine and saving fuel.
Using the buttons of the timer, up to three switch-on times can be programmed at which the auxiliary heating automatically switches on.
Use the auxiliary heating to:
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preheat the vehicle interior and defrost the windows.
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better start the engine in cold conditions.
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augment the vehicle heating at low outside temperatures.
Air distribution and temperature
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Turn the temperature selector to position 2 more.
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Set the air-distribution switch for the windows to the  position.
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Adjust the blower switch as desired while driving.
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When preheating, the blower is automatically set to level 1.
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Adjust the air-distribution switch for the vehicle interior and the air vents as desired.
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Auxiliary heating switch
The auxiliary heating switch is on the dashboard.
Auxiliary heating switch
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To preheat the vehicle interior: press the bottom of the auxiliary heating switch.
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To preheat the coolant and vehicle interior: press the top of the auxiliary heating switch.
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The indicator lamp in the switch lights up when the auxiliary heating is switched on.
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Timer
The time and weekday are displayed constantly, when the vehicle key is in the drive position in the ignition lock or a switch-on time is preselected.
The timer is located below the instrument cluster.
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| Weekday, switch-on day |
| Time, switch-on time or heating time |
|  Heater operation and malfunction (flashing) |
| Sets the time:  forwards |
| Sets the time:  back |
 | Switches the auxiliary heating on/off |
 |  Selects the memory slot or activates/deactivates the switch-on time |
 |  Sets the time and day |
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All displays flash after a power failure. The time, day, switch-on times and heating time must all be reset.
Setting the time and day
If the vehicle key is turned back as far as it will go in the ignition lock, the display will go out after 15 seconds.
Switching on the auxiliary heating
If the vehicle key is turned back as far as it will go in the ignition lock:
If the vehicle key is turned to the driving position in the ignition lock:
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Press the button.
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The display shows the time and weekday, as well as the symbol.
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If the vehicle key is turned back as far as it will go in the ignition lock while the auxiliary heating is switched on, the auxiliary heating remains on for a further 15 minutes. Remaining heating time is displayed.
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Switching off the auxiliary heating
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Press the button.
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The blower switches off. The auxiliary heating runs on for approximately 3 minutes. When the display goes out, the auxiliary heating has switched off.
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Setting the switch-on time
Preselecting a switch-on time
You can preselect the switch-on times either for the next 24 hours or for one week (max. 7 days).
A preselected switch-on time is deactivated after the heating process and needs to be reactivated for subsequent heating processes.
Checking the switch-on time
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Press the button.
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The set switch-on time (time and weekday) is shown for approximately 5 seconds in the display.
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Deactivating the switch-on time
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Press the button repeatedly, until memory slots no longer appear in the display.
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Setting the heating duration
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Press and hold the button until the current setting flashes.
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Set the heating duration (1 to 120 minutes) using the or button.
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The setting is stored when the display disappears.
The auxiliary heating automatically switches off after the heating time has elapsed.
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- open,
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closed
- open,
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or 