2005 Mercedes E-Class Owner's Manual - Page 214

Controls in detail 4-zone automatic climate control* Deactivating Press button P( page 206) or button 0 ( page 207). The indicator lamp on the button goes out. Defrosting is turned off. Maximum cooling MAX COOL If the left and right air distribution controls as well as the airflow volume control are set to U and there is a high need for cooling, the display "MAX COOL" appears in the front and rear display. This provides the fastest possible cooling of the vehicle interior (when windows and tilt/sliding sunroof* or tilt/sliding panel* are closed). Warning! Air recirculation mode Switch to air recirculation mode to prevent unpleasant odors from entering the vehicle from the outside. This setting cuts off the intake of outside air and recirculates the air in the passenger compartment. Activating Press button O( page 206) or ( page 207). The indicator lamp on the button comes on. i G When the outside temperature is below 41°F (5°C), only switch to air recirculation mode for short periods to prevent window fogging. Window fogging may impair visibility and endanger you and others. If you keep button O pressed, the side windows and the tilt/sliding sunroof* or tilt/sliding panel* will close. 212