It those work, I've done it in the past.

Removed the radiator from the car! drain it an clean as good as possible. air dry really good, find the leak, if the spot thats leaking can be sanded a little, do it, you want to apply the JB weld to direct metal, not paint. Let it dry good, and should hold up till you can save up for a new one.


Better then quick fix, that stuff stays in the system and messes up the water pump or other things, but the jb weld, worst case! it leaks again.