I did not know that autostop turned on or off based upon outside temperature. I thought it did turn itself on or off based upon your climate controls. If your AC had a demand for cool air it would turn off autostop. If the heat was on it would disengage. Apparently from what you have written it wasn't actually based upon climate controls but outside temp. Interesting.Before buying my 2021 trailblazer I had a 2017 Chevy Cruze. The auto stop feature on the Cruze would disengage when the outdoor temp was below +5c I think, plus or minus a few centigrade. My trailblazer seems to auto stop well below zero. Is this normal?