> Seeing as how 60-70 are both reasonable temperatures in Fahrenheit and speeds in miles per hour, it is not at all clear at a glance what that number means.

I would not even consider the speed being on the center console so I’d have assumed it would be the temperature either way.

However in all the cars I’ve used that would either be completely inanimate (as affordance as it would be easy to hit when trying to increase or decrease the temperature), or it would lead to extended climate control configuration (e.g. vent speed, multi-zone temps, …).

I’d never think of looking for the defroster there though: while defrosting uses the same hardware as climate control (heating and vents), it’s not actually the same function.