In the morning when the car is cold i add water to the radiator and then turn my car on with out the radiator cap. the water burst out the filler neck and it goes so high. i think is the water pump but i'm not sure it does not leak water .
Try adding anti freeze instead of water. It's gotta be leaking minute amounts of liquid if you have to fill. Also, never start your car with the radiator cap off, it's an open system if you do that and you will lose pressure and possibly damage your seals.
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