There's only one temperature sensor, that's the sending unit located in the junction block for the upper radiator hoses, beneath the fuel tank. Since your temperature gauge is working, I think we can rule it out. The part located in the left radiator that you jumped electrically is a thermostatic switch, it turns the fans on and off at a preset temperature. Since your fans are working when you jump that switch, you've found your problem. Now for the bad news - CSC does not sell that switch individually, it is considered part of the left radiator assembly, which retails for US $279.95. The good news is that SpudRider found an interchange for it, check post #34 in this thread:
http://www.chinariders.net/showthrea...t=15528&page=3
I don't know for sure that this switch fits, since I'm not aware of anybody who has needed one, but Spud was usually pretty thorough on his part interchange research, so I think it is worth a try. The part is showing on eBay for US $6.63 with free shipping, which is a lot better than what CSC wants.