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Yes agreed. Where it is hot, I seldom open the fresh air vents for the AC. There is a workaround if one still have this need. You can see where the fresh air intake is, remove the seal except those that are right adjacent to the intake hole. The recommendation is for cases where a car is found to be overheating. As Iamnotahippee mentioned, it is a known quick fix.
I was hoping that the discussion has opened up the idea that hot air at the base of the winshield might modify airflow over it. There might be a remote chance of reducing Cd. This might be useful for Pickups and old Saabs where the angle of the windshield is more upright than your normal sedan. If this is proven, then that energy waste wouldnt be such a waste after all.
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