2005 Mercedes SLK-Class Owner's Manual - Page 174

Controls in detail Climate control i When you turn the thumbwheels 4 and 7 upwards to the first stop, the fixed center air vents 3 and 8 and the adjustable center air vents 5 and 6 are open. When you turn the thumbwheels completely upwards, only the adjustable center air vents 5 and 6 are open. For draft-free ventilation, move the sliders for the center air vents 5 and 6 to the middle position. i Severe conditions (e.g. strong air pollution) may require replacement of the filter before its scheduled interval. A clogged filter will reduce the air volume to the interior. If the vehicle interior is hot, ventilate the interior before driving off. When the retractable hardtop is closed, do not obstruct air flow by placing objects on the air flow-through exhaust slots below the rear window. Keep the air intake grille in front of the windshield free of snow and debris. 174