Q: Antifreeze leaking from banjo bolt

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So whenever I put antifreeze in, it leaks/comes out from the oil coolant line- the banjo bolt that connects to the radiator to be exact. I just got a new radiator, just got a new banjo bolt cause I thought the threads were bad, and just got a new coolant line. Installed it and put antifreeze in and it leaks from the bolt! I don't know if I have the wrong size, I don't know if I need a adapter or if the radiator has one built in, and I don't know if I can use washers to close up some loose space? Don't know much about cars, so really any things helps! I've tried everything.

My car has 82000 miles.
My car has an automatic transmission.

You should have a sealing washer on each side of the banjo so it will seal.

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