Great idea! I was in the process of starting to figure out how to do that! I too have a Cold Case radiator. On mine as delivered, the fan wire diagram had the fans BLOWING air foward thru the radiator! A call to them resulted in being insulted by the representative! He told me basically that I was stupid and that's not how it worked. So I swapped the wires to have the fans suck thru the radiator(opposite of the wiring diagram)
but that had the blades sucking off of the back side. According to my air velocity meter the air flowed at a "whopping"( I'm being sarcastic, but accurate) 8.3 MPH!
So I decided to turn the fans around on the shafts. Didn't work, they hit the shrouds. So I made spacers to just barely allow the blades to work. That netted airflow of 17.9 MPH, a notable but pathetic number. Next I detailed the casting flash off of the blades, hubs, inside of the outer ring and finger guards, and that got the flow up to around 19 MPH. Still not enough for me. Next I decided that the finger guards are very close together, and mechanical fans don't have finger guards anyway, so I removed 2 out of every 3 guard rings, and left all of the radial supports. Viola!
23.8 MPH on one fan and 24 on the other! On top of that, the fans are much quieter!
A quick follow up call to cold case resulted in the rep (don't think it was the same guy) Also insulting my intelligence by telling me their engineers were smarter than I, and they had never seen any of the issues that I related!
I did ask them if there were any cases reported where a 3 year old was running next to a driving car with the hood up and stuck their fingers in the fan.
I now realize that I and my airflow meter are stupid, but my fans run for less time and are quieter. Just sayin'..
TIMINATOR