I did a similar trip in our EV yesterday, perfect for the first half hour, then the car decided, I assume because of the high temperatures and high demand on the batteries (65 mph) that it needed to focus on maintaining a reasonable battery temperature and switched off the cabin aircon. Cue sweltering conditions and open windows.
We played a game, there were countless EV’s with windows open, could this be a weakness in the design and operation of EV’s? Certainly I think we would have been better off in the Plus Six yesterday!