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Problems with the rear window defroster Problem Possible causes/consequences and M Solutions The rear window defroster has deactiva- ted prematurely or can- not be activated. The battery has not been sufficiently charged. X Switch off any consumers that are not required, e.g. reading lamps, interior lighting or the seat heating. When the battery is sufficiently charged, the rear window defroster can be activated again. Switching air-recirculation mode on/off General notes You can also temporarily deactivate the flow of fresh air manually if unpleasant odors are enter- ing the vehicle from outside. The air already inside the vehicle will then be recirculated. If you switch on air-recirculation mode, the win- dows can fog up more quickly, in particular at low temperatures. Only use air-recirculation mode briefly to prevent the windows from fog- ging up. Activating/deactivating X Turn the SmartKey to position 2 in the ignition lock ( Y page 162). X To activate: press the g rocker switch up or down. The indicator lamp in the g rocker switch lights up. Air-recirculation mode switches on automati- cally: R at high outside temperatures R at high levels of pollution R in a tunnel The indicator lamp in the g rocker switch is not lit when automatic air-recirculation mode is activated. Outside air is added after about 30 minutes. X To deactivate: press the g rocker switch up or down. The indicator lamp in the g rocker switch goes out. Air-recirculation mode deactivates automati- cally: R after approximately five minutes at outside temperatures below approximately 41 ‡ (5 †) R after approximately five minutes if cooling with air dehumidification is deactivated R after approximately 30 minutes at outside temperatures above approximately 41 ‡ (5 †) if the "Cooling with air dehumidifica- tion" function is activated Switching the residual heat on or off General notes Vehicles with rear-compartment climate control: once the engine is switched off, it is possible to make use of the residual heat of the engine to continue heating or ventilating the rear and front compartment of the vehicle for approximately 15 minutes. If the "Residual heat" function is set for only the front or only the rear compartment, it is possible to continue heating or ventilating for approximately 30 minutes. Vehicles without rear-compartment climate control: once the engine is switched off, it is possible to make use of the residual heat of the engine to continue heating or ventilating the front compartment of the vehicle for approx- imately 30 minutes. The heating or ventilation time depends on the temperature that has been set. 152 Operating the climate control systems Climate control |