I just replaced the water pump and oil cooler pipe (metal version) last week in my 2012 LR4 with 178k miles, along with a couple cooling hoses that were looking tired. My primary leak (large enough to leave drips of coolant on the ground) is now gone, however I'm still losing coolant.

I put dye in the coolant and pulled out the UV light and borescope this evening. I found coolant collected in the valley back by the oil cooler pipe, and it looks like seepage around what I think is the cross-over pipe. Can anyone confirm? Unless coolant could be spraying up on this from elsewhere, it looks like this is the next target in what's becoming a cooling system refresh.

Front cross-over was replaced by a shop back at 108k miles... I guess this one failing at 70k miles is plausible?

Thanks for any guidance.

Borescope photos attached - ignore the not-very-orange coolant... that's the dye.

 

That's what it looks like to me. The originals in my LR4 lasted 50k miles. I'm thinking about swapping them out again with the Lucky8 kit after only a little over 40k on the replacements for peace of mind.

 

Did you use OEM as your replacement? My originals lasted over 190k. I just replaced them (front and back) with OEM as well as the waterpump.

I tried to go with the Lucky8 kit, but they were out of stock and back ordered for over a month so had to go with OEM

 

Yeah, the replacements are OEM.

 

Go with the aluminum ones. I replaced my original pipes around 75k miles with the upgraded single piece design. At 115k miles I had to replace my valve covers gaskets so swapped out the pipes for the new aluminum ones. The outside of the single piece pipes looked brand new, but the inside of the pipe looked like it was starting to have a number of cracks and crinkles, like the pipe was failing from the inside out. Thats was a bit concerning because it means the new single piece pipes still will fail, but they will could give less warning than the original two piece design that would fail at the seems.