I have read several incidents where drivers got stranded and car got damaged when radiators fail and ATF mixed with coolant. Since I do not tow or drive in very hot days all the time, and I replace my ATF every 30k miles, I do not feel like I need an external ATF cooler. Just need to replace a faulty radiator very early should be enough. So I am wondering whether anybody is aware of some good places to look so that a failing radiator can be spotted early on. Thanks!