I have a '99 GSR that started steaming on the way home today. I popped the hood and there was coolant all over the place. It looked like it was coming from the top of the radiator where the metal meets the plastic top. I cleaned it up and started the car again and sure enough it was leaking out from the top of the radiator where the plastic top is attached to the rest of the radiator. Do I need a new radiator? What else could have caused this. My car only has 58,000 miles on it I'm confused.