Hey Zeto,
I don't think there would be enough heat to evaporate a strong downpour, even when you see heating rising from those vents.
That being said, I believe a lot of water (perhaps "a lot" is a relative term) makes its way into the engine bay in any car, during rainy days, be it through the air intakes (and around the radiator), or from the bottom. This is a guess, though, as I have never opened my hood after getting home from driving through a storm to check.
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