I noticed the overflow port on my radiator seeps coolant. So I bought a cap part # 7816. I did a bunch of work including freeze plugs and trans rebuild. Filled the radiator with coolant (yes, I flushed the system first) to the top of the radiator and once I confirmed a good flow I put the cap on and it seeps coolant from the overflow port. I am not sure if it is just "finding it's level" or if I have a problem. I noticed that some of the replacement caps have no pressure-release device but...
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