The next thing i would do is to replace the thermostat, it may be stuck closed and causing the overheating. the other thing that can cause this would be the waterpump impeller is rotted and not pushing the coolant or a bad headgasket, the gasket when bad will allow exhaust into the cooling system and this stops the flow of the coolant, theres a test that can be done to check this, you may have to go to a shop or buy a block tester kit, this is a tube that holds a liquid that will change colors if exhaust fumes are in the cooling system, this is done at the radiator fill where the cap is, you would drain some coolant out and then put this over the fill hole and watch it, good luck, i think you may just have a bad thermostat. also i assume all the belts are on, like the waterpump belt, the fan does spin.
Could be a couple of things...make sure your fan's drive belt is not loose....make sure the radiator's finn's are not cloged with leaves etc...or the themostat might be stuck shut.
Check fan if electric check running properly if mechanical bolted to engine check the clutch and belt usually the fan clutch goes and causes the fan not to spin fast enough to draw air across radiator also check belt for proper tightness other problem would be bad thermostat
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