I have a 300D Turbo 1985. I broke the plastic fitting on the top of the radiator that connects to the line going to the plastic overflow tank (Don't know how I did that was only checking around the air cleaner). Since it broke off flush with the radiator there was nothing to connect the line to. I managed to snap a plastic vacuum fitting into the radiator were it broke off and it seems to have a nice secure fit and drove some 80 miles with the temperature at 110 max which is quite normal for my car. Any opinions on whether I need a new radiator? I'm thinking I can use a tap to make a threaded hole and find some threaded plastic or metal fitting?