I looked at it from underneath and it appears there is trans fluid where the fins meet the end cap.
Lexus Q&AAsk Your Question
2006 Lexus GX470 Question: Could transmission fluid leak out of one of the end caps on my gx470 radiator?
Answer #1G. T. Service Center (4231 Answers) , Stephenville, TX - (254) 638-3236ProfessorG May 04, 2014, 19:08Master
Could be due to the transmission cooler in the radiator.
Reply06gx470, May 04, 2014, 19:10Rookie
Any way to repair this or is the best answer a new radiator?
ReplyProfessorG, May 04, 2014, 19:14Master
It would be easier to replace the radiator instead of tearing the radiator apart and replacing the tank. A new one can be a lifetime warranty. O'Reilly's are lifetime and are fairly inexpensive.