I've stood by the driver's door of my cars when the electric fan runs. Heat comes out from under the firewall, and it's an effective wind.
In an 80'F parade, my HHR towing a trailer as big as itself 2 mph had about a 10% duty cycle with the fan. It'd go up to 217' then quickly drop to 200' and repeat. If Florida is 110' then the delta between rad temp and ambient air is only 30% worse than my example.
Saw hood louvers on a CHP crown vic, looked dumb!
I wonder where this hoods-open "policy came" from: top-down or bottom-up.