Mercedes-Benz 2013 C Class Sedan - Manual (Page 131)

ECO start/stop function
During automatic engine switch-off, the ECO
start/stop function only operates at a
reduced capacity. If you require the full
climate control output, you can switch off the
ECO start/stop function by pressing the ECO
button (
Y page 146).
i The ECO start/stop function is not
available on AMG vehicles.
Overview of climate control systems
129
Climate control