2009 Mercedes SL-Class Owner's Manual - Page 174

Controls in detail Climate control system conditioning is activated, or press button y. X Residual heat and ventilation With the engine switched 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. Activating: Press button ,. The indicator lamp in the button comes on. Automatic climate control panel with MAX COOL activated Air recirculation mode Switch to air recirculation mode to prevent unpleasant odors from entering the vehicle from the outside (e. g. before driving through a tunnel). This setting cuts off the intake of outside air and recirculates the air in the passenger compartment. i The air recirculation mode is activated automatically at high outside temperatures. The indicator lamp in button , is not lit when the air recirculation mode is automatically switched on. A quantity of outside air is added after approximately 30 minutes. X i If you switch on the residual heat function when outside temperatures are high, only the ventilation will be switched on. 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 Deactivating: Press button , again. The indicator lamp in the button goes out. Activating: Switch off the ignition. Press button 9. The indicator lamp in the button comes on. Deactivating: Press button 9. The indicator lamp in the button goes out. the ignition is switched on G Warning! Fogged windows impair visibility, endangering you and others. If the windows begin to fog on the inside, switching off the air recirculation mode immediately should clear interior window fogging. If interior window fogging persists, make sure the air 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†) X The residual heat is automatically turned off: Rwhen Rafter Rif approximately 30 minutes the battery voltage drops 172