2010 Mercedes S-Class Owner's Manual - Page 374

372 Rear window defroster window fogging persists, make sure the air conditioning is activated, or press button ¬. X i If you switch on the residual heat function when outside temperatures are high, only the ventilation will be switched on. i Regardless of the selected air volume, the blower operates at low speed when heating. In case of ventilation the blower operates at higher speed. i How long the system will provide heating depends on the coolant temperature and the selected temperature. The blower will run at low speed regardless of the air distribution control setting. X X Activating: Press rocker switch g up or down. The indicator lamp in the rocker switch comes on. i The air recirculation mode is activated automatically at high outside temperatures. The indicator lamp in rocker switch g is not lit when the air recirculation mode is switched on automatically. A quantity of outside air is added when the cooling demand is not at maximum. If the air conditioning has been turned off or the outside temperature is below 41‡ (5†), the air recirculation mode will not switch on automatically. X Controls in detail Activating: Switch off the ignition. Press rocker switch Ì up or down. The indicator lamp in the rocker switch comes on. X Deactivating: Press rocker switch g up or down. The indicator lamp in the rocker switch goes out. Deactivating: Press rocker switch Ì up or down. The indicator lamp in the rocker switch goes out. The residual heat is deactivated automatically: Rwhen Rafter Rif Rif the ignition is switched on i The manually selected air recirculation mode is deactivated automatically: Rafter 5 minutes if the outside temperature is below approximately 41‡ (5†) Rafter 5 minutes if the air conditioning is turned off Rafter 30 minutes if the outside temperature is above approximately 41‡ (5†) Residual heat and ventilation With the engine turned off, it is possible to continue to heat or ventilate the interior for up to 30 minutes. This feature makes use of the residual heat produced by the engine. approximately 30 minutes the battery voltage drops the coolant temperature is too low Rear window defroster G Warning! Any accumulation of snow and ice should be removed from the rear window before driving. Visibility could otherwise be impaired, endangering you and others. The rear window defroster uses a large amount of power. To keep the battery drain to a minimum, switch off the defroster as soon as the rear window is clear. The defroster is switched off automatically after approximately 6 to 17 minutes of operation depending on the outside temperature.