225 still running hot

With the radiator cap OFF, start the car and let it come up to temp, paying attention to when the thermostat opens. You'll be able to tell when the water in the upper tank gets hot. After the thermostat opens, get out of the way of the filler neck and reach in and rev the engine up. If it spews water up and out of the filler neck, you have a stopped up radiator and the coolant coming out of the engine has nowhere to go.