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I don't know if you have one or a buddy but pressure test it. Get it up to operating temp, shut it off, connect pressure tester adapter and gauge then pump it up to the psi rating on the cap. Let sit over night and see if you A have a pressure drop and B if you have visible signs of coolant leaking. But, just so you know, I recently replaced an engine assembly for a customer that had the water pump impellers fracture on the inside causing it to overheat and ruin every seal known to mankind.
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