2007 Mercedes C-Class Owner's Manual - Page 186

Controls in detail Automatic climate control Activating Moist air can fog up the windows. You can dehumidify the air with the air conditioning. Press button 2 or 9 ( page 175) 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. 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. Activating Switch off the ignition ( page 32). Press button 9 ( page 175). The indicator lamp on the button comes on. Deactivating Press button 9 ( page 175). The indicator lamp on the button goes out. The residual heat is automatically turned off: when the ignition is switched on after about 30 minutes if the battery voltage drops i How long the system will provide heating depends on the coolant temperature the temperature set by the operator The blower will run at speed setting 1 regardless of the air distribution control setting. ! 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. 185