Anyone with the V8's run into issues where the trans coolers tend to leak coolant?

[Johnny_5]

I got a pop up a few days ago to check coolant level and found that the reservoir tank was pretty much dry. Filled it up the next day and had the car idling and noticed little drops coming from the under panel so thought it was the valley pan but if I recall correctly its usually towards the back of the engine where you will find the leaks. Anyways dropped the front splash guard and found that the trans cooler right side where it connects to the radiator was leaking. I pushed it back on there and it stopped leaking but I dont trust it. Its been fine for years but just randomly started to leak. At least I was home just moving the car when that check coolant light came up! Anyways Im tempted to just replace the O-ring that goes to it on both sides but wanted to see some opinions if I should just change out the entire unit? Do these tend to go bad eventually? Or should I just swap out the orings and call it a day? Curious if anyone has had this problem and what they did to resolve it.

Thanks

[mike_dmt]

It's better just to replace it. I did mine at 120k, no leaks THERE for now at least. For now.

[jcp240z]

Pull and flush it while you have it out. Replace the o-rings. The only real failure I’ve heard of is the thermostat.
The rings degrade over time. I had the same thing. Replaced the rings 5 years ago, no issues. It’s cheap to do, especially if you plan and do it when you are replacing the coolant.
There are kits on eBay to also re-ring the coolant hoses, but I’d replace those every 100k