There are several things that affect when the auto-stop will work in the HCH. There's been many posts on this, but here it is:

1) available brake pressure
2) outside temperature
3) exhaust temperature
4) A/C on not in EOCN mode

Basically, auto-stop will work under these conditions:

- exhaust is warm
- there's enough brake pressure in the line

Now for the outside temperature/climate control stuff:

Autostop will not engage if:

1) outside temperature is less than 40 deg F, and the fan is on.
2) ECON mode is off (ECON mode is automatically on if the fan is off)

Therefore, if it goes below about 40 deg F outside, if you want autostop to work, turn off the fan when you come to a stop -- then it'll engage no matter what the outside temperature (even 0 degrees), providing the exhaust is up to temperature and the brake pressure is up.

The HCH assumes if the outside temp is cold, and you have the vent fan on, you want to heat the cabin, and that's more important than auto-stop.

Mark