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  #1  
Old 03-05-2016, 09:45 AM
93_Rarity 93_Rarity is offline
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Default Tranny Cooler Line Leaking at Radiator

So I'm having an issue. I'm putting a new radiator in my truck because my old one was cracked and leaking coolant. I got everything torn apart, reinstalled, and when I started him up my lower line was leaking. I pulled it back off, and everything seems to be in order. Called AutoZone, they said it needed o-rings, but the lines didn't have o-rings when I pulled them off and there aren't any in my old radiator either. And mine wasn't having any ATF leakage with the old one." "Well you need them." Ok, no biggie. Got a huge assortment of o-rings, two hours of switching and finigling around, still leaking. So what am I missing here? Any ideas?
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Old 03-05-2016, 12:15 PM
Jswifto Jswifto is offline
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Can you take a pic of your tranny line? And no you should not need orings
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  #3  
Old 03-05-2016, 12:27 PM
MNRANGER2002 MNRANGER2002 is offline
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Default Re: Tranny Cooler Line Leaking at Radiator

Only thing off the top of my mind is that either for some reason on the new cooler the threads are different or the threads got crossed threaded and are not sealing all the way
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Old 03-05-2016, 01:49 PM
GSF1200S GSF1200S is offline
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Default Re: Tranny Cooler Line Leaking at Radiator

Quote:
Originally Posted by MNRANGER2002 View Post
Only thing off the top of my mind is that either for some reason on the new cooler the threads are different or the threads got crossed threaded and are not sealing all the way
I dont trust radiators with tranny coolers in them at all, especially if its not OEM. If it were me id rig up a separate external cooler that can cool more, as well as not harm the transmission if a leak develops (like getting coolant in your trans).

Anyways, its got to be thread related. Id take the radiator back and get a refund, go to another parts house and try their brand. Perhaps youll have better luck?
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  #5  
Old 03-05-2016, 01:54 PM
sheltonfilms sheltonfilms is offline
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Default Re: Tranny Cooler Line Leaking at Radiator

No o-rings needed. They are flare fittings.

The fitting on the radiator should have a hex shape. Try tightening the nipple on the radiator. Maybe it came loose.

If you put an oring on, get rid of it. Anything but a a dry flare connection will leak. Pipe sealant will cause a leak. Pipe tape will cause a leak. An oring will cause a leak.
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  #6  
Old 03-05-2016, 07:44 PM
rcobb rcobb is offline
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Default Re: Tranny Cooler Line Leaking at Radiator

So when installing a new radiator u don't need pipe tape what so ever on any threads?? I'm installing one soon I need to know...
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  #7  
Old 03-05-2016, 07:56 PM
Jswifto Jswifto is offline
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It is just like brake lines no tape
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Old 03-05-2016, 09:52 PM
sheltonfilms sheltonfilms is offline
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Quote:
Originally Posted by rcobb View Post
So when installing a new radiator u don't need pipe tape what so ever on any threads?? I'm installing one soon I need to know...
Yeah flare fittings never need anything extra.
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  #9  
Old 03-05-2016, 10:09 PM
Ordinary Biker Ordinary Biker is offline
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Default Re: Tranny Cooler Line Leaking at Radiator

X2 ^^

In a flared fitting application the threads are not the sealing surface:



The surface labeled 'tubing seat' seals against the flare.
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  #10  
Old 03-05-2016, 11:59 PM
93_Rarity 93_Rarity is offline
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Default Re: Tranny Cooler Line Leaking at Radiator

I apologize for not responding, I've way overslept. I appreciate all the responses and will just dump my old one back in and take the new one back in the morning. I appreciate it y'all!
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  #11  
Old 03-06-2016, 06:56 AM
rcobb rcobb is offline
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Default Re: Tranny Cooler Line Leaking at Radiator

What about the threaded pieces going into the radiator they don't need tape?
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  #12  
Old 03-06-2016, 09:47 AM
rcobb rcobb is offline
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Default Re: Tranny Cooler Line Leaking at Radiator

My old raditor is thicker yet new one is thinner. Did I buy the right one??
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  #13  
Old 03-06-2016, 09:17 PM
Jswifto Jswifto is offline
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Nope
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  #14  
Old 03-07-2016, 06:38 PM
Undrstm8ed Undrstm8ed is offline
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Default Re: Tranny Cooler Line Leaking at Radiator

Quote:
Originally Posted by GSF1200S View Post
I dont trust radiators with tranny coolers in them at all, especially if its not OEM. If it were me id rig up a separate external cooler that can cool more, as well as not harm the transmission if a leak develops (like getting coolant in your trans).

Anyways, its got to be thread related. Id take the radiator back and get a refund, go to another parts house and try their brand. Perhaps youll have better luck?
beat me to it... The Nissan frontier was notorious for this exact same issue, the dealership fix was an external trans coolers..
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