A GM dealership will sell "radiator stop tabs" (look like little hockey pucks) and you can crush them up and put them in the radiator to help stop the leak. I will prob get reemed for saying to use this by others, but I and another jeep buddy of mine have used them with success. The tabs cost $5 at the most.My radiator is leaking (1992 4 cyl, 101,00 miles) again. I replaced it once (50,00 miles) already and am a little strapped for cash. Is there an additive that I can use to temporarily plug the small leaks until my ship comes in?