I just purchased it from a church member and she told me about the leak.
Cadillac Q&AAsk Your Question
1999 Cadillac DeVille Question: I have a leak in my radiator. What can I use to temporarily stop the leak?
Answer #1cardocIII from Gillespie's Auto Service, November 15, 2013, 14:42Master
The best thing you can do is have the radiator repaired or replaced. Attempting to use a sealant is not only likely to fail, it can also have unintended consequences.
ReplySexyNES, November 15, 2013, 15:49Rookie
Answer #2G. T. Service Center (2366 Answers) , Stephenville, TX - (254) 638-3236ProfessorG November 15, 2013, 17:15Master
I agree the radiator needs repaired; Also, for many years back in the 90's the manufacturer has always recommended adding pellets,(for leaks) which the dealer has always carried, to your radiator, (cooling system), Because of minor leaks on Cadillac models. Has been an automatic addition to any cooling system repair, drain & refill, or flush on Cadillac's.