i would like to know what these two buttons are for please. i have a diesel 220 eligance and on the dash it has two buttons with ec on one and rest on an other, does anyone know what these are for and what they do please. thanks

 

ec turns off the ac compressor and rest is when you turn the car off the climate control fan will still blow "residual" heat into the car.

 

thank you very much your help will go a long way