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Hello, I am Jose Sebastian. Your automotive expert, It's a pleasure to me to attend your question. Thank you very much for trust in just answer.
Dear customer radiators normally leak through the caps as you will see radiators have two caps an upper and a lower one, these caps due to excess pressure tend to open and do not fill the radiator properly so they start to play, I recommend replacing the radiators when this happens because some people take the radiators in for repair to save a few pounds but these repairs are usually useless as sometimes after a short time they fail again.
I hope this info to be helpful, my goal is to give you the best advice i can, I hope to be helpful, if you have any doubt or want to know anything else please do not hesitate to reply back.
Kind regards, Sebastian.