2009 Mercedes R-Class Owner's Manual - Page 178

Controls in detail Overview of climate control system functions and air vents Air vents G Warning! 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 may 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. For best possible performance of the climate control: X Keep the air intake grille in front of the windshield free of snow, leaves, sticks, and any other debris. X Center air vents Side air vents 1 Left center air vent, adjustable 2 Right center air vent, adjustable 3 Thumbwheel for air volume control for Example illustration driver's side 1 Left side defroster air vent, fixed 2 Left side air vent, adjustable 3 Thumbwheel for air volume control for adjustable right center air vent 4 Thumbwheel for air volume control for adjustable left center air vent X adjustable left side air vent X Opening/closing: Turn thumbwheels 3 and 4 upward or downward. Opening/closing: Turn thumbwheel 3 upward or downward. Always keep all air vents and grilles in the passenger compartment free from obstruction. i For draft-free ventilation, move the adjustable center and side air vents to the middle position. 176