If you would all please allow me a stupid question. ( I think we are allowed 1 a year). By putting in both coolers in front of the radiator, does it reduce the radiators capacity to perform at its optimal level???
The short answer is Yes! Having said that, like Deb said, the least amount of clutter in front of the air openings, i.e, big bumpers, lights, winch & solenoid pack, grille badges, etc. You know, like the crap I have.
The more CFM you can pull through them, such as bigger fan, more fans, etc, the better. Also, doing things to reduce underhood temps like keeping things out of the engine compartment help. Air compressors, AUX batteries, big air boxes, remote shock reservoirs, and even larger/thicker splash guards and fender flaps can contribute. Like Devon said, the thermostat is doing the bulk of keeping temps in the normal ranges but all the above are small contributors to heating things up. The best solution would be a fan that pulls more CFM than factory and/or keeping the additional coolers as far apart from each other as possible, as heat likes to gang up.