The stock stator puts out about 80 watts ac.  When you put a rectifier on the system so that  it can charge a 12 volt battery, the power to the battery or to power the fan directly will be 1/2 of the ac power or 40 watts.  I think the fans on your computers CPU are about 15 watts each.  Putting 3 CPU fans on your LT 500 radiator is not much air.

You could install a 5 gallon coolant storage tank in series with the radiator.  This would help store some of the heat during those short times your radiator is not working when you are using the bike for something it was not designed for.

Suzuki named them Quadracers because of their design.  Suzuki could have put a 20 amp 12 volt charging system with a huge battery, so that you could have an electric start, light bar, electric winch, hand warmers, sound system, electrically activated reverse, heated seat and electric wipers.  If they came equipped like the aforementioned, Suzuki would have named it something like Big Red, Rincon, Rhino, Rock Crawler or Hunting Quad.