XJ ( X351 ) 2009 - 2019

2015 XJL 5.0L Supercharged - Coolant Pipe Upgrade - Small tube location?

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Old Oct 22, 2025 | 02:48 AM
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Default 2015 XJL 5.0L Supercharged - Coolant Pipe Upgrade - Small tube location?

I need some help to jog my memory. I have been taking my time to do a coolant pipe upgrade because of leaking Y-pipes. I am also exchanging the rear crossover. As I begin to assemble the items in the rear of the engine I noticed a small tube (in my hand in the picture) that traverses down the back of the engine and exits to the bottom rear of the engine bay. It sits at the level of the symposer at the top, but the tube connections to the symposer seem fixed, ie - one pipe/tube connects the top of the symposer to the bottom of the symposer. Anyhow, can anyone point me in the right direction as to the connection point for this tube? I am drawing a blank as I reviewed the symposer and the super charger (top and bottom) and I could not locate a suitable home. Please help! I'm hoping to get moving on making the final repairs, but I am stuck on this one.
2015 XJL 5.0L Supercharged - Coolant Pipe Upgrades - Dont remember what this tube attaches to. It runs across the back and goes downstream of the engine bay.
2015 XJL 5.0L Supercharged - Coolant Pipe Upgrades - Don't remember what this tube attaches to. It runs across the back and goes downstream of the engine bay.
 
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Old Oct 22, 2025 | 03:09 AM
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Old Oct 22, 2025 | 07:44 AM
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Is it the metal vent pipe from the transmission?
 
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Old Oct 22, 2025 | 10:20 AM
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Your pictures are confusing so this maybe wrong? But I think RoverJoe is right.




The small plastic tube I have circled is a vent for the transmission and is open ended. So it does not attach to anything.
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Old Oct 22, 2025 | 11:50 AM
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It is plastic. It is entirely possible that this was behind the coolant crossover pipe / plastic cable wire loom and that it was unconnected, and I just didn't see it. I was hoping someone had a diagram they could convince me with as I don't want to button everything up and have this be a source of problems.

It is plastic. It is entirely possible that this was behind the coolant crossover pipe / plastic cable wire loom and that it was unconnected, and I just didn't see it. I was hoping someone had a diagram they could convince me with as I don't want to button everything up and have this be a source of problems.
It is plastic. It is entirely possible that this was behind the coolant crossover pipe / plastic cable wire loom and that it was unconnected, and I just didn't see it. I was hoping someone had a diagram they could convince me with as I don't want to button everything up and have this be a source of problems.
 
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Old Oct 22, 2025 | 03:19 PM
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It is the transmission vent line, and they are plastic, not metal.
 
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Old Oct 23, 2025 | 06:57 AM
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As I posted above and as 12jagmark posted above. It's a plastic vent tube for the transmission.

Here is the thread where we figured it all out. With MUCH better pictures.
Transmission Vent Tube
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Old Oct 27, 2025 | 02:32 PM
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Sorry I was thinking the newer ones where they went to metal lines, but yes that's the breather tube.
 
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