1967 Cuda FB project

SNKEBIT said

Wouldn't the recirc system be better for removing humidity with the a-c? Less humidity coming in the car and removing more and more each time it recirculates. In defrost, the a-c is on..... just asking................:D I am no hvac guy, that is for sure.
I know there is a reason all cars have fresh air intakes, just wondering if I can get away with my idea because it wouldn't get used much.

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At one point cars had to have fresh air intakes due to law I believe. There is always some concern of "poisoning" a trapped volume of air inside a car, either with enough people using up the oxygen (unlikely, but I suppose technically possible) or an exhaust leak into the cabin that doesn't get flushed out with fresh air coming in. Old cars don't typically seal that well to begin with, so it likely not really an issue and a very small risk, but I suppose possible.