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In my 81 if u blast heat in a 30 deg day it can take up to 10 miles to warm up. But off it about 3 miles.
Cut off about 2-3 miles with a grill block. But that is where I am at now.
Oh interesting note before grill block my 81 would cool back off to the c line. If it was under 30 and fully warm. U could suck all the heat out of it and it would soon blow cold. Hasn't done that since block.
So in my experience with every car I have driven yes. I usually turn the dial to cold and hit recir. also trucks take almost twice as far as cars.
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