Yep it is me again. Last night I changed out the thermostat in my 2003 silverado with the 5.3. Okay so now I have replaced the clutch fan, flushed the radiator and changed the thermostat. No off gases or water in the radiator. Loaded the A on the trailer and headed north to mow. Well after the first hill the gauge went up to 230 F. Got to the top and it cooled back to 210. Ran along at 210F on the level and heated up on the hills. Stoped and checked the fan when the gauge was at 230 degrees F and there was no resistance whatsoever. Aren't these things supposed to lock up and then spin counterclockwise? Appreciate any and all advise or comments. Also I won't post anymore about this problem. Thanks.