2003 Mercedes E-Class Owner's Manual - Page 171

Controls in detail Climate control Residual heat and ventilation* 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 key in the starter switch to position 1 or remove it from the starter switch. Press button T ( page 164). The indicator lamp on button T comes on. Deactivating Press button T ( page 164). The indicator lamp on button T 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. 171