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Transmission line going into radiator leak

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Old Nov 18, 2017 | 06:06 PM
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EEVEE's Avatar
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Default Transmission line going into radiator leak



drip.... drip.... drip.....



Cant remember how it was before. Looks like it maybe backed off?


Ok before i attempt to touch this i would like some input to minimize damage. Anyways to make this stop? I think it needs to be tightened but i never dealt with this setup before and dont want to screw it up and make a bigger leak. My assumption is to loosen that nut towards the rad then tighten that back nut on the line then whats that middle nut?
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Old Nov 19, 2017 | 12:13 AM
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If it were me I would take it off, little teflon tape, put it back together, and see what happens.
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Old Nov 19, 2017 | 05:36 PM
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It's hard to tell what you are referring to. The middle "nut" on the brass part is part of the compression fitting. The fitting is threaded on both ends. You might try just gently turning with a wrench on the middle to cinch it onto the rad better with another wrench on the flared fitting on the metal tubing. You could also try to gently remove the flared fitting on the oil cooler tubing and then tighten the fitting on the rad.

You can buy the metal trans cooler tubing with the flare nut attached if you wreck it. Not the end of the world. Keep a container underneath to catch the transmission fluid if you take the line off. Looking at the picture, the fluid on the ground looks like coolant, not transmission fluid. Maybe your lower rad hose is leaking and it's not the transmission cooler tubing.
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Old Nov 19, 2017 | 06:22 PM
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Originally Posted by Ralph77
If it were me I would take it off, little teflon tape, put it back together, and see what happens.
Had the same leak in my 97 and this worked for me.

I had pull the front clip off, lift up the rad, undo that fitting... wrap it in a little Teflon tape then reinstalled everything. Has not leaked a drop since.
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Old Nov 19, 2017 | 07:02 PM
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Originally Posted by 67 GMC
It's hard to tell what you are referring to. The middle "nut" on the brass part is part of the compression fitting. The fitting is threaded on both ends. You might try just gently turning with a wrench on the middle to cinch it onto the rad better with another wrench on the flared fitting on the metal tubing. You could also try to gently remove the flared fitting on the oil cooler tubing and then tighten the fitting on the rad.

You can buy the metal trans cooler tubing with the flare nut attached if you wreck it. Not the end of the world. Keep a container underneath to catch the transmission fluid if you take the line off. Looking at the picture, the fluid on the ground looks like coolant, not transmission fluid. Maybe your lower rad hose is leaking and it's not the transmission cooler tubing.
I thought so at first but it smelled the same as the trans fluid and i looked and it was dripping right from that line. And thanks for the info! and i will try that teflon tape. This was so annoying to find after getting it all spiffed up too
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Old Jun 20, 2023 | 05:55 PM
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I had a leak in the same location. The metal line was a little loose and I didn't want to just tighten it and strip the threads. I was able to loosen the nut without taking out the upper radiator panel and lifting the radiator up. I did remove the fan and lower radiator hose. I used a larger needle nose pliers and it turned easy enough to loosen without destroying the nut. I cleaned it up and wrapped some teflon tape around the back half of the threads. I did get it threaded back on after a few tries and then tightened it pretty snug with about 1/4" of threads for a gap left. The metal line was not loose and it did not leak. Take note that the metal line was rubbing against the frame and was worn through maybe half of the wall thickness. It is very tight at the 90 degree bend and the frame. If I were you get that replacement part. I am going to replace the radiator and mount a transmission cooler so I did not get a replacement.


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Old Jun 20, 2023 | 06:27 PM
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