Check the coolant fan see if it turns on when the engine gets hot. if not then your temp sensor could be bad
Be care-full my radiator blew up and burnt me. I replaced Radiator, thermostat, and water pump. Timing belt is in the way so I replaced it too. OK Now
Check the timing.
you might want to check for a blown head gasket or a cracked head or block. espically if it loosing water out of the radiator with out leaking on the ground.
check your radiator. is it clean or does it need to be replaced? a simple cleaning cured my problem.
check your fan clutch if its weak it will overheat
did you check the radiator or the head gasket?
Is the cooling fan[s] coming on? is the radiator full of coolant ?does the engine have a blown head gasket or cracked head? Why did it need a radiator?
dose the electric fan run if not check the relay if it runs check the water pump
You either have a cracked block, blown head gasket, or intake manifold gasket leaking coolant into the engine oil. You have bad problems.
have the engine timing checked. if the timing is wrong the engine will overheat, are you loosing coolant?is the fan working, is the water pump working?
did you use the right anti-freeze or you may have a bad fan/fan switch
had the same problem with a sibring,took to the garage,they replaced the thermostat and gasket and found a hairline crack in the thermostat housing they replaced the housing and everything was fine then