Yeah I'm positive it's getting hot. I have an IR thermometer and I can visually see the temp difference between the tstat housing and the heads/block. I have put a few $10 stant fail safe tsats in and they all have the same outcome. Even has a good stant safety rad cap that holds proper pressue. If I continue to drive/ don't pull over and let it idle or shut it off for a few min... Then it goes up 230 plus and pukes coolant out all over the place... I can go about 2 miles from my house before it decides to get up to 200 then by 3 miles it's at 230 unless I pull over. Sometimes I get lucky and it opens fast enough not to puke everywhere while I'm driving. It really is driving me nuts! Lol