These went bad on my friends. You can replace the fittings in the radiator and I did the line as well since it was rusty. Anyway, I went to the dealership and got the fittings for like 8 bucks. I think its a 18mm socket and it comes out of the radiator. After I changed the line (which was only 26 bucks from GM) and the fitting no more leaks. Good luck with the fix man.