i had similair thing with mine but was leacking inbetween were the nut joins the cooler and were the fins start. as temp measure i cut some rad hose to about 3/4in 18mm wide then jublie cliped it up. lasted a couple of weeks. i could not find a good 2nd hand one so useing a ford scorpion cooler with pipes made up by plant fitter.
its working a treet fingers crossed,touch woood.