2008 Mercedes CLS-Class Owner's Manual - Page 202

Controls in detail 4-zone automatic climate control Air conditioning The cooling function, only operational when the engine is running, cools the vehicle interior down to the selected temperature. The cooling function also dehumidifies the air in the vehicle interior, thus preventing the windows from fogging up. Deactivating It is possible to deactivate the air conditioning (cooling) function of the climate control system. The air in the vehicle will then no longer be cooled or dehumidified. Press button 2 ( page 190) or ( page 191). The indicator lamp on the button goes out. Activating Moist air can fog up the windows. You can dehumidify the air with the air conditioning. Press button 2 ( page 190) or ( page 191) again. The indicator lamp on the button comes on. The air conditioning uses the refrigerant R134a. This refrigerant is free of CFCs which are harmful to the ozone layer. ! If the air conditioning cannot be turned on again, this indicates that the air conditioning is losing refrigerant. The compressor has turned itself off. Have the air conditioning checked at the nearest authorized Mercedes-Benz Center. Residual heat and ventilation (Canada only) With the engine switched off, it is possible to continue to heat or ventilate the interior for up to 30 minutes. This feature makes use of the residual heat produced by the engine. i Condensation may drip out from underneath the vehicle. This is normal and not an indication of a malfunction. Warning! G If you turn off the cooling function, the vehicle will not be cooled when weather conditions are warm. The windows can fog up more quickly. Window fogging may impair visibility and endanger you and others. i If you switch on the residual heat function when temperatures are high, only the ventilation will be switched on. i Regardless of the selected air volume, the blower operates at low speed. 201