i have fluid in my engine the car over heated i replaced thermostate

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i have fluid in my engine it over heated i replaced my thermostat,oil,oil filter,spark plugs,spark plug wires,antifreeze,i now have even more fluid in motor and keep haveing to fill everflow and radiater with fluid and still overheat,i even had no thermostat and it over heats no nocking in engine,no smoke car is hesitating because of fluid in engine what needs to b fixes