Would be easier to test using compressed air hose. Plug 1 end of core, air into other. That way you can slowly increase air press., while core is submerged in water, and observe for bubbles. I'd go 2x times max cap rating. If replacing it is a REAL pain, as some are, test at min 2x or have recored & not woory down the road..
That was i was going to do. I was just wondering why people were talking about the pressure of a garden hose. No replacement available that I know of. I will probably have to have a radiator shop recore it if I need to.
