My truck CONSISTANTLY runs 220-235 and now and then it gets into the red zone. This when im hammering the hell out of it in a mudhole or goin down the highway in OD. I blew the radiator out with an air compressor yesterday and it dropped the operating temps 5 - 10 degrees. Should I flush the system. Also my truck is turbo charged so is a higher operating temp to be expected. My old 6.2 in a C10 I used to drive never got much over 195.