even so, when the car is travelling on the roads at 60,70,80km+ etc the whole engine bay is full of cold air, a pod would never suck in hot air whilst driving as the heat never stays around.
The only issue with hot air would be when idling as the hot air is not pushed out by any flowing air from movement.
Also, putting down the bonnet would be more off from real world results, as the dyno fan can only do so much which is usually aimed at the FMIC/Radiator