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On my nearly brand new Scion FR-S I had a few years ago, I remember that the heater leaked heat through the blend door. I clearly remember some of my parents' new cars doing that when I was a kid too. I thought it was a normal feature of all cars, but I have since seen a few cars (including the one I have now) that don't blow warm air, which is SO nice. The sun puts enough heat into the cabin already, engine heat is very unwelcome :/
As far as I can tell, every single car that has the intake below the windshield will blow air at you with the fans not on unless you turn on recirculate, because the base of the windshield is a high pressure zone. If the seals or plastic panels blocking things off are missing or damaged, you can be sucking in engine bay air. Some cars tuck the intake elsewhere and won't have air blowing at you on the freeway.
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