4-vettes

I too have heard the fresh air theory. But only in places like this. Never in a actual service school.
Factory service information back when I was a young man stated the issue of motors not running after a long period of inactivity.

interpon

here ya go

Bikespace

A screenshot of a @lars post is better than anything I could come up with, but here's a possibly related lawsuit from 1972.

https://www.nytimes.com/1972/02/17/a...-corvairs.html

75 had the blower always running, and was also the last (full) year for Astro Ventilation. And the first year for catalytic converters, too. I wouldn't mind having those triangular vent windows that C2s and Corvairs had, though.