2008 Mercedes C-Class Owner's Manual - Page 258

Controls in detail Dual-zone automatic climate control Deactivating: Press button ¯ ( page 250). The indicator lamp in the button goes out. 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. Warning! Activating: Press button , ( page 250). The indicator lamp in the button comes on. i The rear window defroster is automatically deactivated after some time of operation depending on the outside temperature. i If the rear window defroster switches off too soon and the indicator lamp goes out, this indicates that too many electrical consumers are operating simultaneously and the load on the battery is reducing available voltage. The system responds automatically by deactivating the rear window defroster. 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. G 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 conditioning ( page 258) is activated, or press button y. Deactivating: Press button , ( page 250) again. The indicator lamp in the button goes out. i The air recirculation mode is deactivated automatically: after 5 minutes if the outside temperature is below approximately 41°F (5°C) after 5 minutes if the air conditioning is turned off after 30 minutes if the outside temperature is above approximately 41°F (5°C) 257