Maxi-<-----------------------Air Direction-------------------------------
Case | Radiator | Fan | PC Internals | Front intake fans
How I have my AIO set up. Fan takes cold air from the front and blows it over the radiator out the back.
Update; Okay well I switched around the position of my radiator and fan like you said, along with applying some arctic silver thermal paste, and I'm now idling at 38 degrees celsius, so I must have done something correctly, thanks for the info