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They did redesign the front crossover pipes, but not the back. The redesign was not too long ago as I understand (maybe a year or two ago I think). I did the crossovers this summer, and the new part numbers for the front pipes are LR090630 and LR092992.
The redesigned pipes are still plastic, but they don’t have the “flange” type design they had before (looked like two half pipes glued together). They also did away with the aluminum insert that joined the older pipe system together.
Frankly, the new pipes don’t look as sturdy to me as the old ones. The joint between the pipes also doesn’t seem to fit together as tightly as the old pipes did with the aluminum, and this could be a new failure point. And, I’m not convinced the main problem has been solved, which seems to be heat degradation of the pipe where it meets the block. I know some people have had trouble with the pipe delaminating, but if you look at failures throughout the land rover and jag forums, it seems like degradation of the pipe in the “valley” is the more common problem.
The redesigned pipes look like they’d be cheaper to make, and that could have been the motivating factor here. But who knows - maybe they’re using a more heat resistant plastic. But I’m not betting on it - this will be an item I replace again at 50-60K intervals.
As for the dealer replacing it, I had coolant smell that the dealer even noticed, but they wouldn’t do anything because there was no leak in the leak test. Tested it 3 times at two different dealers. So I repaired it myself. It wasn’t leaking, but that pipe in the valley was shot and the coolant smell is gone since I replaced it.
Getting ready to do all the coolant pipes and hoses, as well as water pump in my wife's 2015, as I noticed the coolant was about 3/4 quart low. When I did a search on the parts list up in this thread, most parts came back incorrect for the 2015, for example, part search for "LR090630" returns the following:
"This part does not fit your 2015 Land Rover LR4Change vehicle"
At this site:
https://www.landroverpartscounter.com/oem-parts/land-rover-water-manifold-lr090630
Most of the other parts display the same fitment issue....
Tim
This is what I used for our 2015
Front crossover kit:
https://www.amazon.com/THERMOSTAT-CONNECTOR-RANGE-DISCOVERY-LR018274K/dp/B07XRFZ5Z5
Rear crossover:
LR109401