No radiator and no heat. I had the displeasure of riding from the Catskills in upstate NY down to the city in my ex-partner's Bug in the middle of the night during a winter cold wave...absolutely freezing...took me two days to regain the use of my legs.
If my memory serves me correctly, the "fan" was the outside air and only activated during forward movement of the car, and the outside air at the time was frigid. . Don't recall what year the BUG was....this was early 70s.had to turn the fan on, they had enough heat to melt your shoes