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Q: how to stop a leak from the flare bolt plugs on 1999 Honda Civic

i had recently changed the radiator in my honda civic, and when i put the coolant lines back on. i had transmission fluid coming out of the top of the bolt when i start the car. i have taken the bolt plug out, cleaned it off and done about everything else i could think of, and it still leaks. any suggestions?
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well, i'm talking about where the banjo nut comes out of the radiator i've tried the teflon tape, so if the threads are bad. does that basically mean i need a new transmission? would some gasket sealant possibly work? or what would you suggest?
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