The temp on my truck continues to climb. My gauge will go well above 210 if idling but drive down the road and temp starts to come down again into expectable range. The first thing I did as pull thermostat, still climbs. Next changed radiator because it was really old, still climbs. Replaced clutch fan, still climbs. Tested gases in radiator to see if exhaust gas was present, test was good. I also have no fluid in oil and no smoke out exhaust. I have done compression test on engine and radiator, all pass. I have also verified temp sensor, it is accurate. The thing that really bothers me is why its so high with no thermostat. If I look in radiator water seems to be following well. I am completely lost on this one, any help would be appreciated.