the dye trick works best for oil and a/c leaks,
use a pressure tester.
wash all the suspected areas clean
pressurize the system to 15psi (don't go any higher than that) and find where the coolant is coming out of.
call around to the auto stores that rent out tools and one of them should have one. be sure to make sure it has the right adaptor to fit on your radiator before you take off from the store, get home, and wonder why it won't work.
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