Back when I was a kid in the 50s, I lived in SW Texas. 100s in the summer south..
There were hardly any cars with AC. But, they all had flip up vents that directed air inside the car.
In most cases, there was a handle down under the radio (they used tubes back then)
and with you pulled it out, the vent input would flip up in the center, just behind the hood.
A lot of cars also had side vents. Same handle setup down low with the vents just forward of the front doors.
See that one just aft of the front right wheel?