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first, make certain the thermostat is not installed backwards, if still hot then remove a radiator hose and see if coolant is discharged with pressure behind it(this checks the water pump); it is also a good idea to flush the cooling system; make sure there is not debris in front of the radiator; beyond all this you may just have to have a professional diagnose it

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Q: You replaced the thermostat and radiator cap and its still hot?
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