I've got a pin hole on the motor side of the radiator. About two inches from the top towards the passenger side. I've used Barr's /Bards stop leak to some success in past cars that I didn't care about. Is there any reason one shouldn't use it again? I'd rather not buy a new radiator if not needed. But I don't want to adversely affect anything else. The leak is sooo small. In the right lighting and at the right angle you can see it misting out.