I just noticed that my 240 with an auto trans is leaking coolant where the top transmission cooling line enters the right-hand side of the radiator. I was able to loosen the nut on the radiator very easily with my bare hands, so I cleaned the washer and the area up, and retightened the nut. However, it won't seal up - coolant still leaks regardless of how loose or tight I have the nut. I don't want to crank it down too tight, as the side of the radiator is plastic. Should I use a sealant on it? And if so, what sort of sealant (silicone?). Or do I need a new radiator? -- the present one is less than 5 years old.
Thanks!
David
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