turbo/supercoupe dual fans in my 5.0

i am putting dual fans from a supercoupe in my 87 5.0 mustang. the shroud fits perfectly as its the same radiator . there is good clearance from the pulley system if u have already deleted the smog pump. my problem is..i want to run one fan for the cooling, and the other for the a/c cycle. need a relay to work for this. this is instead of simply running both fans as one. this speculation is derived from the fans having the same motors, yet slightly different fan blade profiles. i think maybe the stock settup uses this same way, one for the cooling and one for the a/c cycle. only seen in the j yard, so no testing on running car. this is gonna work great though, when i get it wired.
 
If the fans have separate power lines, I would think two realys would work. One set up normally with a thermostat and the other spliced into the ac power line. That way the second one would come on with the AC. A little more work, but that would make it work the way you want.

Good luck!