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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.
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.