97 TJ 2.5L. I put a new T-stat in last fall and necer got really any heat and the guage was always about 170. This week I pulled it apart and found the stat stuck open. I did a cleaning/flush, all new hoses, new Stant Superstat 195 amd mew T-stat housing. Still have the same issue. With the engine running for 40 min hoses are warm and when I look in the radiator there is no coolant moving.. Put in anothe Superstat and no change. I am also thinking of replacing the temp sending unit. But do not see one at the back of the head just the one on the T-stst housing. What should I do next? It is getting cold.