I own a '92 Jeep Cherokee Laredo and I am trying everything to not get rid of it. I love the car to death but I'm putting in more than it's worth. My latest of problems is that the petcock/drain valve on the radiator leaks coolant as if it weren't there. I have tried tightening it but that didn't stop it from leaking. The leak is from the center of the plug. There is no leak around it. What I would like to know is what would have caused this problem and if buying a new valve would fix it, or, just putting a bolt of some sort with the same threading, or, using some sort of substance to seal the hole on the valve such as a strong form of putty or something. I would go a head and just plug the hole but I'd like to know what caused it and if it is safe to do so. Thanks in advance.
Michael