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Transmission coolant line question

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Old Feb 1, 2020 | 08:01 PM
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Transmission coolant line question

So I've been having some coolant leakage at the rear of the engine. It seems that it's coming from the transmission coolant lines behind the engine, just above the center plate. What is odd is that about 6 inches of one of the coolant lines (probably the one leaking) is rubber, while the other is completely solid tubing. Is this how it should be or did someone do a "repair" at some point?

Thanks,

John
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Old Feb 2, 2020 | 01:11 AM
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Check ur heater hose connector - my car 57k miles & that plastic piece just cracked - it gets brittle & old
& will leak from there
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Old Feb 2, 2020 | 12:32 PM
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Just as manufacturers use flex-pipes in the exhaust to deal with engine movement during throttle changes, they use rubber hoses in various lines that go from moveable parts to static parts. While the radiator is mounted on rubber pads, that's to prevent vibration fatigue, not to handle motor and transmission movement. Someone will chime in shortly who has fiddled with these lines and can answer your question.
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Old Feb 2, 2020 | 02:40 PM
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Originally Posted by Kpmikey808
Check ur heater hose connector - my car 57k miles & that plastic piece just cracked - it gets brittle & old
& will leak from there
Thanks, though this is leaking behind the engine, so unlikely to be the heater hose.
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Old Feb 2, 2020 | 02:43 PM
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Originally Posted by slartibartfast
Just as manufacturers use flex-pipes in the exhaust to deal with engine movement during throttle changes, they use rubber hoses in various lines that go from moveable parts to static parts. While the radiator is mounted on rubber pads, that's to prevent vibration fatigue, not to handle motor and transmission movement. Someone will chime in shortly who has fiddled with these lines and can answer your question.
Understood. Just seemed strange to have only one with a hose between. Looked at the FSM and it doesn't look like there should be a hose there. I may just see if I can find a replacement hose to fit and use worm gear hose clamps.
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Old Feb 2, 2020 | 04:16 PM
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Originally Posted by slartibartfast
Just as manufacturers use flex-pipes in the exhaust to deal with engine movement during throttle changes, they use rubber hoses in various lines that go from moveable parts to static parts. While the radiator is mounted on rubber pads, that's to prevent vibration fatigue, not to handle motor and transmission movement. Someone will chime in shortly who has fiddled with these lines and can answer your question.
Okay, I'm an idiot. The hose definitely looks OEM and goes from the pipe end to the coolant manifold on the transmission. It has very specific bends in it so off to find a part number.
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Old Feb 2, 2020 | 05:19 PM
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Any chance you can post a picture of the failed hose? If this is something other than the infamous heater core hose/coupling, then it is another object of potential concern. TIA!
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Old Feb 3, 2020 | 09:26 PM
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Originally Posted by ILM-NC G37S
Any chance you can post a picture of the failed hose? If this is something other than the infamous heater core hose/coupling, then it is another object of potential concern. TIA!
Yeah. I'll get a pic going. Maybe the P/N can be identified as well.

Thanks
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Old Feb 9, 2020 | 09:45 PM
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Pics

Hope everyone had an awesome weekend.

I apologize for the delay. Lots going on. Here are some pics of the hose. It attaches to the upper coolant port on the transmission. The lower is a pipe, not a hose. Hope this helps. If anyone could get a P/N that would be awesome. I've looked through infinitipartsonline and others and everything shows a pipe direct to the tranny.







Thank you.
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Old Feb 9, 2020 | 11:57 PM
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If you have a coolant leak behind the engine, one possible source could be below:


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Old Feb 14, 2020 | 12:00 AM
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Originally Posted by antirice
If you have a coolant leak behind the engine, one possible source could be below:

I don't think that's it. On my transmission cooler manifold, both input and output are about 2" apart. Looks like yours are quite a bit apart. I'm going to look closer at the routing on that and see if it matches the turns on my hose.
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