Mercedes-Benz GL-Class: Important safety notes - Setting the air vents - Climate control - Mercedes-Benz GL-Class Owner's ManualMercedes-Benz GL-Class: Important safety notes

WARNING When operating the climate control, the air 
When operating the climate control, the air that enters the passenger compartment through the air vents can be very hot or very cold (depending on the set temperature). This could cause burns or frostbite to unprotected skin in the immediate area of the air vents.
Always keep sufficient distance between unprotected parts of the body and the air vents. If necessary, use the air distribution adjustment to direct the air to air vents in the vehicle interior that are not in the immediate area of unprotected skin.

In order to ensure the direct flow of fresh air through the air vents into the vehicle interior, please observe the following notes:

keep the air intake grille on the hood free of blockages, such as ice, snow or leaves
never cover the air vents or air intake grille in the vehicle interior.

the sliders of the air vents to the center For virtually draft-free ventilation, adjust the sliders of the air vents to the center position.

    Setting the center air vents
    1 Center air vent, left 2 Center air vent, right 3 Center vent thumbwheel, right 4 Center vent thumbwheel, left ► To open/close: turn thumbwheels 3 and 4 to the right or left. ...

    See also:

    Folding the rear bench seat forwards
    If the driver's or front-passenger seat is set for a larger person, it may not be possible to fold the rear bench seat forwards. In this case, move the front seats as far forward as possible. ...

    Parking Brake
    Set the parking brake by holding the regular brake pedal down, then pushing down the parking brake pedal. If the ignition is on, the brake system warning light will come on. See Brake System Warn ...

    Using the USB Port
    For vehicles with a USB port, the connector is located in the instrument panel storage area. See Instrument Panel Storage  for more information. Radios with a USB port can control a USB stora ...