hi everyone, i have a small leak in my coolant system, i can see where the coolant is coming down the engine and leaving a kind of dried coolant residue, someone put a pressure tester on it and tested it and he said it was fine and to be honest it doesnt hardly leak at all, it just seems to be when it gets hot for a longer time like on a long distance trip, an ideas? i put some radweld in just to see if it would fix it. it doesnt seem to be coming from a pipe though?!