Took me over a year to find a leak on mine, turned out to be the plastic tee piece positioned at the top of the rad. Replaced it with an ally one and havent lost a drop for months. Must have only leaked when hot and just flashed off as there were no signs of a leak and when I inspected it once removed one of the hose connections was oval, probably due to someone fitting a jubilee clip and over tightening.
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