I always laugh when guys put the car on the trailer when it rains. They qualified, they are out the money, but they say their windshield fogs. yea, no heater lines will do that. I get they want to save weight, but ALL of them aren't Will Power, and I bet NONE of them can tell the difference if 10 pounds is added to the car ....it's just a mental thing for them. "Real race cars don't have heater cores".
Well, my shelf has a bunch of trophies I won in the rain in my what must be fake race car, LOL. The one that has a fully operating heater core, that not only keeps my windshield clear in the rain, but acts like an addition radiator should I need supplementary cooling, if the radiator gets blocked with paper or something in the race.