My Car wont stop overheating ive changed radiator thermostat, uper and lower int

head gasket.hate these engines.so many 3.1 3.4 n 3.8s do this

Radiator fans working?.... Loosing any coolant at all??.... Suggest getting a combustion leak test, at most any good repair shop!!!

Had the exact same problem with this model. My car only takes engine coolant with DEX COOL. Regular coolant always results in an overheat. You can read about it in the manual......Also, my mechanic replaced some kind of gasket (sorry cant remember which). It was formerly rubber/plastic and the new one was metal which worked much better. Hope this helps.