So I at least detected the leak. Removed the plastic undertray, which reveiled the rad. There it was, just like in CooperMan's car. CooperMan was also right in predicting the tanks were brass and not plastic. Small leak between the surface of the rad and something soldered to it that looks like a penny washer although with a big hole in the middle - to give room for the tap valve. The valve itself looks ok, no visible leak. Next step is to find someone who can solder it. Local garage said no, would not embark on such a task and thus take the resonsibility. Maybe a cooper or a plumber? Will take some phone calls tomorrow. The leak is very small, surprised that radiator cement did not take care of it, but no. It's a cruel world...
