How about plugging one end and hook the other end up to your garden hose
(House water line are about 18 psi) and see if it leaks. That what I did
anyway and no leaks yet.
Jim
> Is there a good way to test a heater core (out of vehicle) for
> leaks? I have a couple of cores that I'm not sure of, and I'd like
> to rebuild my heater with one that won't get my feet wet :-)
>
> Local shops want about 40 bucks to test, which gets especially
> painful if I have them test multiple cores. I'm especially concerned
> about finding tiny leaks that would drip ever so slowly.
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