I believe that the AC condenser, intercooler, pretty much any other heat exchanger you may have should be in front of your radiator for best results.
I have not noticed any factory instillations with the AC condenser behind the radiator?

Oil and trans cooler could probably be behind the radiator if you had to, as it's best if they stay warm, around 212 or just over, boiling point for water, then the condensation will boil out and go out the vent or breather, but oil should be kept under 250, as that's when oil starts to break down.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-