No pressure at standstill. Minimal pressure at low speed. Enough pressure at mid/high speed to make it worthwhile for OEMs to use that area for the HVAC air intake on nearly all vehicles since the '50s or even earlier.I'm not sure how else to explain this. When you're not moving, where does the pressure you're talking about come from?
Yes, I've heard plenty of folks complain about overheating at medium/high speed. Watch the forums, it comes up frequently.