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the refrigerant going to your A/C condenser is very hot..it goes straight from the compressor outlet to the condenser, so your theory of cool gas couldn't work.
They automatically turn the fan on when you hit the A/C button because that is the most efficient way to run the A/C. The more cooling you get in the condenser the more cooling you get in the car.
That is interesting that the guy was insulating his pipes...in any car I've seen the expansion valve in the A/C system was right in front of the evaporator in the car. But he does have an idea that you may get some heating of liquid refrigerant right before the expansion valve.
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