Hi,
Personally, I'd screen it off. Adding the 3rd radiator is unecessary, adds 4 more connections and 2 hoses which can leak, and increases the potential for Radiator Damage (they're not too robust and you'll expose the entire width of the car to possible damage from Stones, other debris, which would cause the whole system to fail). Car would also take much longer to reach operating temp and open 'T'stat. Hope this helps...
Happy Motoring!... Jim'99
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