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“Destroying” is a bit dramatic...
My 2017 with 57000 miles has all the black flex tubing that protects the wiring flaking away. It crumbles with a light touch. This is happening anywhere near the heater core tubing and the alternator. Any solutions for this? I don’t want to put on more flex tube just to replace it again
 

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pretty much normal.
 

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+1 on the hood. You won't be able to do anything about the operating temp but you will cool it down faster after shutting it off
 

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2016, Mine was gone at 35k. I re-did mine when I had to do a valve job, so far so good at 50k. As I recall there was a high temp option on the split sleeve.
 

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Hmmm, reading this is making me nervous about looking at a JKU this weekend!
don't be, it is just the cheap plastic conduit that is falling apart not the wires. Happens on most cars and trucks not just jeeps.
 

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Just looked at the alternator area of my '16 (19,980 mi on the clock). The plastic is still in pretty good shape. Looks pretty well like it did when it was new.
 

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Something I should be watching for?

So the crumbling conduit conundrum, is this something I should watch for when I look at the JKU? If it is fairly common, ok. But is it an indicator that should I find it, I should check out something else?
 

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This is fairly common on all cars, some more than others. I'm sure FCA does not use the best quality split looms. I get high temperature split looms from ElecDirect.com. They sell various diameters in 50 foot sections for about $20 each. I've used these on most of my cars and hotrods, including my 2015 JK with 45K miles.
 

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Better than split loom, get some actual 3m cloth electrical tape.
It'll outlast any Jeep on the road and is a few bucks.
 

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I put electrical tape around mine then a piece of conduit tape
 

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I just discovered this on my '14. The engine compartment split loom just breaks by touching it. I found this when I saw some of it had collapsed on the generator (as apparently it's called now) then starting checking other areas. To me that's really surprising. I've wrenched on quite a few vehicles of various ages and never have seen that stuff just disintegrate like that in such a uniform fashion around the engine compartment.
 
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