I'm not sure what's going on with my new Equinox. I've had many GM cars before, all with digital temp control and auto setting, and setting it on auto at 72 was always perfect in these other cars. In the Nox, if I set it on 77 it blows cold air, but on 78 it blows super hot air. There is no "in between". I can't find a comfortable temperature using auto; can't find not using auto either. Anyone had a similar issue?