Trans cooler lines leak at radiator

2

200kss

Not-quite-so-new-guy
Apr 17, 2006
17
3
Missouri
I've installed 2 new radiators in 2 different cars. 1 a higher end aftermarket aluminum radiator and the other a standard plastic/aluminum replacement. Neither of them will seal at the upper transmission cooler line port. Adding Teflon tape to the threads slow the leak down to just a trickle
 
-83MONTESS-

-83MONTESS-

Moderator
Moderator
Nov 4, 2010
4,570
113
Bellevue, Ohio
Are you using the right fitting? Is it a pipe thread or straight thread?
 
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pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
25,626
113
Kitchener, Ontario
if two rads leak and teflon tape only slows it down I would be looking at the flare on the pipe, you'll probably have to cut it off and flare it again. The tube nut is probably ok to use it again
 
Last edited:
565bbchevy

565bbchevy

Geezer
Aug 8, 2011
6,537
113
Michigan
What are your trans lines made of?
 
2

200kss

Not-quite-so-new-guy
Apr 17, 2006
17
3
Missouri
These are original lines, that did not leak with the previous radiators. Hard to believe both new radiators have issues but I have verified the lines are not cracked nor cross threaded.
 
565bbchevy

565bbchevy

Geezer
Aug 8, 2011
6,537
113
Michigan
2 radiators with the same issue make the lines most likely the culprit, You can replace the lines with Cunifer tubing and they will seal better.
 
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