Our 2000 Saturn has developed a coolant leak at the outlet shown in the picture. This is (facing the front of the car) at the top right of the radiator. The 1/4" metal line looks good as do the threads for that connection. The leak seems to be coming from the larger octagon shaped flange that goes around it. I can't tell if this is another threaded port or what. The part of the radiator right there feels plastic. For now the vehicle is drivable but needs water added weekly. I didn't want to take a wrench to it to open it up if I have some eroded threads or something that I will not be able to repair at home.