I had this problem and it was one of the plastic sides to the radiator. It never leaked when hot or cold but as it cooled down from being hot it would sometimes lose coolant may be once every 6 months. When it happened you could see a slight drip from the side of the radiator from looking under the car. You could not see anything from above
I guess it is something to do with the way the plastic side and metal core expands and contracts at different rates. Why it only does it very occasionally I don't know.
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