I live in Malaysia, and have the ventilated seat option. It blows air and is not cold. But it definitely prevents a sweaty back, which was my intention given how hot it is here and how I used to exit my previous BMW after every drive which did not have this option. Initially I too was disappointed that the air was not colder, but over time, I realized that if it had indeed been cold air, my muscles would have cramped up during a long drive. Hence I think that's why BMW do not vent cold air thru the seats. Believe it or not, but I actually turn on seat heating and ventilation on a long drive to prevent backaches (I have a slipped disc) while ventilation prevents sweating.
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