25ml

Heys guys, I recently bought an C220 W204 estate 2013, and I noticed something very weird about the auxiliary heater / ventilation.

Sometimes when I lock the car and leave, when I return the auxiliary ventilation it's active, pumping air inside the car. But why ?!?!

I've read the manual and it says that function it can only be activated manually, by remote or by pre-defined time. I checked have no pre-defined time and I don't have any remote and since there's no one inside the car, how is it possible he activates by himself?!?! I'm worried that will get my battery drained sometime.

CJG

I don’t even have that button. What exactly is it?