2005 Mercedes E-Class Owner's Manual - Page 217

Controls in detail 4-zone automatic climate control* ! 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 (available on climate control panel design A 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 Turn the SmartKey in the starter switch to position 0 or 1, or remove it from the starter switch. Press button T( page 206). REST in the display comes on. Deactivating Press button T( page 206). REST in the display 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 and the temperature set by the operator. The blower will run at speed setting 1 regardless of the air distribution control setting. 215