2008 Mercedes CLK-Class Owner's Manual - Page 197

Controls in detail Climate control i If you have switched on the defrost function using the P or 0 button, you cannot make any other settings. 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! i The air recirculation mode is activated automatically at high outside temperatures. The indicator lamp on button , is not lit when the air recirculation mode is automatically switched on. A quantity of outside air is added after approximately 30 minutes. Deactivating Press button P or 0 ( page 191) again. The indicator lamp on the button goes out. Defrosting is turned off. The previous settings are once again in effect. Deactivating G Press button , ( page 191). The indicator lamp on the button goes out. i The cooling remains switched on. Windshield fogged on the outside i Keep this setting selected only until the windshield is clear again. Switch the windshield wipers on ( page 56). If the automatic mode of the climate control is switched off: Turn air distribution control 4 to a or Y ( page 191). 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 198) is activated, or press button P or 0. 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) Activating Press button , ( page 191). The indicator lamp on the button comes on. 196