2003 Mercedes C-Class Owner's Manual - Page 154

Controls in detail Climate control Air conditioning The air conditioning is operational while the engine is running and cools the interior air to the temperature set by the operator. Activating Moist air can fog up the windows. You can dehumidify the air with the air conditioning. Press ACOFF again ( page 149). The indicator lamp on the button ACOFF goes out. The air conditioning uses the refrigerant R134a. This refrigerant is free of CFC's 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. i Condensation may drip out from underneath the vehicle. This is normal and not an indication of a malfunction. 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 ACOFF ( page 149). The indicator lamp on the button ACOFF lights up. 154