[chuckm]

I'm not sure about a squirter/spray system to replace a fan. A squirter is going to cool by two mechanisms: conduction and convection. The cooler temperature of the fluid hitting the radiator will provide a small amount of cooling. The real money is in convection. Then energy pulled out by the fluid evaporating off the fins would be huge. But air flow is critical to driving convection. If you don't have enough air flow to cool your radiator without the squirter, I seriously doubt you'll have sufficient air flow to make your squirter effective.

Additional problem: the fluid on the radiator will likely help dirt stick to the radiator fins. The crud buildup will tremendously lower your radiator's cooling efficiency.