As some of you know from the Camp Heep thread, I missed it due to my Jeep overheating on the way up 
That Friday I had made it about halfway up before having to stop. It's currently sitting in the shop at Criswell Jeep in Thurmont, MD; I'm picking it up tomorrow. They've been helpful, and so has Jeep Customer service, so this is not a thread to complain about either of them. It's more about so this doesn't happen to others...
Today they called me to let me know the root cause -- essentially incorrectly torqued bolts from the factory on the water pump Sorry if any of this is incorrect, but trying to summarize what I was told. Their explanation was that I have two coolants, low pressure (in the front of the vehicle) and high pressure (close to the firewall). Because of the loose bolts, I started to lose some coolant from the high pressure side, and when the heat/pressure got high enough it sucked in some air.
The worst part is this is a known issue for JLs with 2.0Ts and that it's been known since at least 2020. The newest TSB is "07-001-22 Rev. B, Apr 28, 2022, Cooling" on "Water Pump Inlet Tube Fastener Torque". This is the TSB PDF: https://www.jlwranglerforums.com/forum/attachments/07-001-22-rev-b-pdf.634359/.
If you go to this forum page, you can see a lot more people with this issue, including losing all their coolant at once, how they preemptively check for it, and what tools they use to fix it: https://www.jlwranglerforums.com/forum/threads/2-0l-water-leak.84706/. It doesn't seem that hard overall.
A lot of people in the thread were around the 7000-10000 mile mark -- I had just hit 8000. The PSA is that the dealer told me that TSBs are not like recalls -- they only check for and fix them once your symptoms start. I also have no idea how to look up what TSBs apply to your vehicle, but I would've wanted to know about this before it happened. I got lucky and I was near a dealership, wasn't off-road at the time, didn't have the Jeep lose all the coolant and go into full limp mode. But I still missed a trip, had a really expensive uber back, lost a lot of time, etc.
That Friday I had made it about halfway up before having to stop. It's currently sitting in the shop at Criswell Jeep in Thurmont, MD; I'm picking it up tomorrow. They've been helpful, and so has Jeep Customer service, so this is not a thread to complain about either of them. It's more about so this doesn't happen to others...Today they called me to let me know the root cause -- essentially incorrectly torqued bolts from the factory on the water pump
Sorry if any of this is incorrect, but trying to summarize what I was told. Their explanation was that I have two coolants, low pressure (in the front of the vehicle) and high pressure (close to the firewall). Because of the loose bolts, I started to lose some coolant from the high pressure side, and when the heat/pressure got high enough it sucked in some air.The worst part is this is a known issue for JLs with 2.0Ts and that it's been known since at least 2020. The newest TSB is "07-001-22 Rev. B, Apr 28, 2022, Cooling" on "Water Pump Inlet Tube Fastener Torque". This is the TSB PDF: https://www.jlwranglerforums.com/forum/attachments/07-001-22-rev-b-pdf.634359/.
If you go to this forum page, you can see a lot more people with this issue, including losing all their coolant at once, how they preemptively check for it, and what tools they use to fix it: https://www.jlwranglerforums.com/forum/threads/2-0l-water-leak.84706/. It doesn't seem that hard overall.
A lot of people in the thread were around the 7000-10000 mile mark -- I had just hit 8000. The PSA is that the dealer told me that TSBs are not like recalls -- they only check for and fix them once your symptoms start. I also have no idea how to look up what TSBs apply to your vehicle, but I would've wanted to know about this before it happened. I got lucky and I was near a dealership, wasn't off-road at the time, didn't have the Jeep lose all the coolant and go into full limp mode. But I still missed a trip, had a really expensive uber back, lost a lot of time, etc.
In fact, I’m certain that’s what they’d prefer you do!