I don't think we're on the same page. There are people that will read this post and turn their heat off and turn the ac on to defrost their windshield. I am trying to prevent that, when you turn the defroster on the car automatically engages the ac to dry the air out but also blows hot air. Just let the car do its thing.

This is done automatically in almost all cars on the road today and vintage cars aren't set up to work like that so don't turn the ac on to defrost your windows.

This is actually how air conditioning and refrigeration work too. The difference is we force a refrigerant to evaporate using a pressure change witch draws heat out of the air; we then force it to condense using pressure and temperature changes to make into a continuous process.