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Well, since the electric fan isn't cutting it either (and I assume it will do it on the road, where the fans no longer matter), I would be suspicious of the radiator either plugged internally OR the outside is full of dirt, bugs, leaves, etc keeping the air flow from passing through the radiator, OR the AC condensor plugged up, again leaves or dirt or whatever keeping air from flowing through. More than likely internal to the radiator though, what's the coolant condition, been flush/replaced/serviced lately? I'd start by pulling the radiator and inspecting the outside and then you can see the condensor pretty well, if all looks fine then get it to a radiator shop for checking.
Gilly
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