I "tested" it by going on a long drive in manual mode when I was running the PWR and Mishimoto trans coolers in series (no radiator in tank regulator), both of which were mounted on brackets and not touching the radiator at all.
Was curious as to how hot the coolers got so did the drive and put my hand on the PWR cooler when I got back. It was quite warm. The only time the car was out of manual mode was when reversing out of the driveway.
Scientific? No. Logical? To me, yes.