There is indeed airflow under the car, just with the coolers mounted the way they are the air very well might just pass over them. One of my old toys I just mounted a pair of coolers behind the bumper. No duct work or anything. Trans never seen over 200*. Truck had a somewhat loose convertor and often seen deep silty trails where the convertor was running at the stall for minutes at a time. A bit early, but Happy 30th Birthday.....