Transmission Cooler line at Radiator leak...Help?? - JeepForum.com
 
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post #1 of 7 Old 08-27-2018, 01:54 PM Thread Starter
b00001
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Transmission Cooler line at Radiator leak...Help??

This is the SECOND time I have removed the radiator for a leak at this fitting. I wanted to ask the group for a little advice on how to proceed.

2004 Grand Cherokee Overland, 4.7 HO V8

The first issue was that I was leaking antifreeze from the lower transmission fitting that went into the radiator. You cannot get a wrench on it so I removed the radiator, pulled the transmission hard line and removed the brass threaded fitting. cleaned everything, used teflon tape, tightened everything up and reinstalled radiator. Success! For about 2 days, then I sprung a transmission fluid leak out of the same fitting!

Same issue, you cannot get a wrench on that fitting, so I pulled the radiator again. I now have the brass fitting as well as the aluminum transmission hard line in my hand. Now that it is a transmission fluid leak, I am wondering if the compression fitting is shot? There is a ring on the brass fitting and you cannot purchase just that fitting. It is part of the radiator assembly, autozone, about $135.

So my question is what to do at this point?

1. new teflon tape everything, try to tighten that fitting down MORE?
2. new radiator $135 and new trans hard line $99?
3. bypass with an external trans cooler from Amazon for $69?

I am on a very tight budget but I do NOT want to go through this again.

Thoughts???

Pics:

Attached Thumbnails
LowerTransFitting.jpg   BrassTransfitting.jpg  

2004 Jeep Grand Cherokee Overland
2005 Jeep Grand Cherokee Limited
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post #2 of 7 Old 08-27-2018, 03:31 PM Thread Starter
b00001
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If I do go the external cooler and totally bypass the OEM internal cooler I am looking at:

Derale 13504 $69 Amazon: HERE
or
Derale 13503 $54.26 Amazon: HERE

Thoughts? Either easier to mount than the other? the 13503 saves me $15.

I would like to find one local if possible, anyone have dimensions I need to look for???

2004 Jeep Grand Cherokee Overland
2005 Jeep Grand Cherokee Limited

Last edited by b00001; 08-27-2018 at 03:42 PM. Reason: Added one more line.
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post #3 of 7 Old 08-27-2018, 05:31 PM
blueseasons
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Shouldn't be doing this. How old is the radiator? In the short term, I'd bypass the radiator and go external. It would drive me crazy not knowing why it happened though.
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post #4 of 7 Old 08-27-2018, 05:34 PM Thread Starter
b00001
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Quote:
Originally Posted by blueseasons View Post
Shouldn't be doing this. How old is the radiator? In the short term, I'd bypass the radiator and go external. It would drive me crazy not knowing why it happened though.
Radiator is about 2 years old. Either the OEM hard trans line flare is shot or the brass piece that goes to the radiator is worn beyond tightening.

2004 Jeep Grand Cherokee Overland
2005 Jeep Grand Cherokee Limited
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post #5 of 7 Old 08-27-2018, 06:50 PM
ravenworks
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When you loosened the fitting and had antifreeze leaking,you broke the internal seal on the tank.
Those coolers are a one time shot from the factory,meaning you do not loosen the tank fittings.
I honestly don't think you have the right adapter for the line.

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post #6 of 7 Old 08-27-2018, 06:53 PM
ravenworks
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Do you remember an "O"-ring involved in any of this?

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post #7 of 7 Old 08-27-2018, 10:39 PM Thread Starter
b00001
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Quote:
Originally Posted by ravenworks View Post
Do you remember an "O"-ring involved in any of this?
No, no o-ring. I did not "break the seal". It was leaking anti-freeze when I got the vehicle. I pulled the radiator and the brass fitting came out with the hard transmission line in pic. Put it all back together and everything was fine for a week or so, then trans fluid started to drip from the hard transmission line and fitting connection.

I just installed an external Trans cooler, 11 inch x 11 inch. Rerouted lines to it and bypassed the OEM. Just took it around the block to check and top off fluids. So far so good.......

2004 Jeep Grand Cherokee Overland
2005 Jeep Grand Cherokee Limited
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