97 Mercury Tracer 2.0 stii getting hot!188000 miles

I HAVE HAD TROUBLE BEFORE. MY CAR HAS HAD TIMMING BELTS REPLACED 2 TIMES. THERMOSTAT REPLACED2 TIMES. WATERPUMP REPLACED 2 TIMES. HEAD CHECKED FOR CRACKS. NO CRACKS, SHAVED REPLACED HEAD GASKET, ALSO REPLACED RINGS AND ROD BEARINGS WHILE I HAD ENGINE TORE APART.188000 MILES ON IT NOW. SO THOUGHT I`d ring and rod bearing it because it got so hot. Transmission won`t pull when it gets hot. Runs great now gets hot pulling steep grades or hills. WHY?Doesn`t boil water out. Help. Could it be a senser?[/B] :? Thanks for all input:(it was the radiator.)I was supposed to use red antifreeze. Instead no one told me, and the green anti-freeze stopped my radiator up. After causeing all my Trouble.