Last week i was driving and i notcied that my temp gauge was at H. When i got home i checked under my hood and saw that my radiator hose was FLAT. it wasnt a circular shape. I flushed my radator and changed both top and bottom radiator hose's. But for some reason my top radiator hose seems to still get flat but it then goes back to a circular shape after you let go of the throttle. any ideas of the problem?