Recently had this problem with a car. I found the top hose had a minute hole (pin hole)in it, with a thin jet of coolant going straight down to the road, missing all else on tne way. V. difficult to spot as only leaked when hot.
I have found Barr's leaks a little more effective than Radweld. I tend to put some in on older cars before a leak starts: you tend not to get problems, as they are fixed before you get to know of them. There is some beneficial lubrication effect too. Despite running elderly cars with over 100,000 miles up, in 45 years and about a million miles done I have only had to replace one pump, and that in 1967. Once I used two tins to mend a frost cracked aluminium head on a Fiat, the crack being about an eighth of an inch.
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