2010 Mercedes ML-Class Owner's Manual - Page 175

3-zone automatic climate control i How long the system will provide heating depends on the coolant temperature and the battery voltage. Regardless of the temperature and air volume set on the climate control panel, an interior temperature is aimed at by 72‡ (22†) and the blower runs on low speed to protect the vehicle battery. X X 173 The residual heat is deactivated automatically Rwhen Rafter Rif Rif the ignition is switched on approximately 30 minutes the battery voltage drops the coolant temperature is too low Activating: Switch off the ignition. Press button Á. The indicator lamp in the button comes on. X Deactivating: Press button Á again. The indicator lamp in the button goes out. 3-zone automatic climate control Control panels USA only Z Controls in detail