2011 Mercedes R-Class Owner's Manual - Page 145

Operating climate control systems dehumidification function remains on. Airrecirculation mode remains deactivated. or X 143 Press the ^ button. Press the à button. Turn the temperature control clockwise or counter-clockwise. Press the K or I button. or X or X or X The rear window heating has a high current draw. You should therefore switch it off as soon as the window is clear as it only switches off automatically after several minutes. If the battery voltage is too low, the rear window heating may switch off. X Turn the SmartKey to position 2 in the ignition lock. X Press the ª button. The indicator lamp in the ª button lights up or goes out. Problems with the rear window heating Windows fogged up on the inside X Activate the "cooling with air dehumidification" function Á. X Activate automatic mode Ã. X If the windows continue to fog up, activate the defrosting function (Y page 142). i You should only select this setting until the windshield is clear again. Windows fogged up on the outside X Switch on the windshield wipers. X Press the P/\21 or O/c21 air distribution button. i You should only select this setting until the windshield is clear again. Activating/deactivating airrecirculation mode You can deactivate the flow of fresh air if unpleasant odors are entering the vehicle from outside. The air already inside the vehicle will then be recirculated. The operation of the air-recirculation mode is the same for all control panels. Rear window heating Activating/deactivating G Warning Any accumulation of snow and ice should be removed from the rear window before driving. Visibility could otherwise be impaired, endangering you and others. 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 conditioning is activated, or press the ¬ button. 21 Canada only. Z Climate control Defrosting the windows If the indicator lamp in the ª rear window heating button flashes, the on-board voltage is too low or the roof is open. The rear window heating has deactivated itself prematurely or cannot be activated. X Switch off any consumers that are not required, e.g. reading lamps or interior lighting. When the battery is sufficiently charged, the rear window heating is activated again automatically.