It will turn off if you set the temp to low or turn on the defroster either by button or by cycling through the air flow modes. But it won't turn back on again when you leave the modes. Thus you have to frequently press the ECO button to enter ECO mode. I've never pressed it to leave ECO mode. And you can't tell if you are in ECO mode by feel (in fact you can't hardly use any of the climate controls by feel) -- you must look down and check with your eyes. This is bad design -- you should be able to work every control with your eyes on the road.