I seem to remember the old VW’s being air and water tight
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Well, they would ‘definitely float, but not float indefinitely’ according to the ad:
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… and their heater/defroster was… theoretical… rather than something that actually existed. 
In all fairness, if one was driving at highway speed, the flow through the heater outlets was good, but at city speeds it was almost non-existent.
I owned a Karmann-Ghia that I bought as a used car, and I installed the heater blower from a '55 Chevy into the heat duct on the driver’s side. That made a major difference–on that side. However, in order to get adequate heat on the passenger side I would have had to install a second blower, and the anemic electrical system could not have supported a second blower running constantly during the winter months.
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That is what I remember also I think you had to crack a window to close the door’s.
VDCdrivers’s comment about VWs reminded me of the time my girlfriend (later became my wife) made a 125 mile trip to Tulsa to see Styx and the J. Geils Band. Upper 20s, forecast for ice and in a 61 VW Bug with a leaky junction box.
The CO got pretty thick and most of the trip there and back was torturous to say the least. Windows down a bit or not? It turned out to be down a bit; alternating between freezing to death and being gassed.
And all while struggling along at 50 MPH or less on the hills…
Concert was great; the ride there and back not so much. I’m surprised the girlfriend did not dump me on the spot.