The air flows out the gap between the hood and the cowl. It's seen the heat rise and had it melt ice and snow in the winter. The air does not back flow into the engine bay due to high pressure.

My coolant temps are stellar. They always have been.

I'll take my real world results any day.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.