How do you reset the interior temperature controls? All winter I had it at 79 degrees now it's summer an every time I get in the car it goes back to that 78 degree setting.

 

Maybe you have your A/C settings tied to your key (Comfort Memory package)? You can adjust the A/C settings outside of the auto memory settings:

Main menu: Select “Vehicle”
> “Settings”
> “Air conditioning”
and confirm.

I don't have my GTS yet so YMMV.