Today I'm back with my car trying to resolve the overheating issue. The 1st thing I did was to drain the radiator of the 50/50 antifreeze, it appears to be clean & free of sediment. Next I plugged the bottom of the radiator and filled it with water, when I released the plug it drained in 4 seconds. The water from the radiator and what came from the engine was clear. The hoses, fan, water pump appear to be working will. I took the car out for a 15 minute trip. Toward the end of the run was a hill by the end of the route she was steaming. While but the car was still running the temperature was 200, after shutting it down it was 208. There appears to be churning in the radiator but no oil film. What to check next?