That's what I figured. Also, when that stat is opening at 160 degrees, I doubt it will ever shut again during that drive cycle. The system is not letting the coolant stay in the radiator long enough to release the heat(not that you have an overheating problem) I'd go with a new stat, see where you are at and then start looking at other components if you think you have an issue, ie. fan/clutch/radiator/timing. Also, did you put that 160 in, or did you get the car with it?
