See also:

Please bear the following in mind
At the onset of winter, have your vehicle winterproofed at a qualified specialist workshop, e.g. at an authorized Mercedes- Benz Center. Observe the notes in the "Changing a wheel" ...

General notes
WARNING If the vehicle becomes trapped in snow, ensure that snow is kept away from the exhaust pipe and from around the vehicle as long as the engine is running. Otherwise, poisonous carbon ...

Setting the rear-compartment airflow using the rear control panel
Turn the SmartKey to position 2 in the ignition lock. To increase/reduce: press rocker switch 14 up or down. ...