Here's another odd one. I have the C-Max plugged into our Level 2 (juicebox 40A) and GO Times set for 10:15 (it's 10:02 right now)... I hear the HVAC system blowing hard, haven't been inside the car yet, I do not hear the engine (at least I don't think the engine's running) but when I go behind the car and put my hand over the tailpipe, there is a gentle stream of COLD air coming through. I figured warm air would indicate the engine was running but I'm mostly curious now why I'd feel cold air coming through the tailpipe... I put my hand right over the tip to make sure I wasn't feeling air coming from something else (e.g. a HVB vent or something).
Not entirely sure I follow... if the air you're feeling is coming out of the tailpipe itself then the ICE must actually be running(or else you've got some SERIOUS problems) Though if you've only set a Go time, and not done any sort of local or remote start then there's no way the ICE should be running either.
If you're just feeling air from somewhere NEAR the tailpipe then I'd say you're just getting interior air being blown out of the cabin, either from the battery fan or other normal interior vents(seems like they like to put them near the rear bumper) from the cabin blower fan.