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Old 10-12-2014, 07:21 PM   #1
EvanVanVan
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Default Small transmission fluid leak from radiator transmission cooler line

I'm trying to decide what I should do, I've got a small transmission fluid leak from either the upper or lower transmission fluid cooler line as it goes into the radiator. I've tried tightening it very tight. While tightening the nut, I held back on the line with a small 6" pipe wrench. Both upper and lower are very tight.

This is a new problem since I replaced my radiator (with a Silla 2067A) and lines a couple months ago. I'm not even sure if it's the line/nut leaking or if it's the larger 1" hex nut that is part of the radiator. I can't warranty/return the radiator because the company ended up giving me refunding me fully for it after a mix up with the shipping.

I'm not sure if I should A. leave it go, and just check it once in a while and top off as necessary. B. Buy a new radiator and install it, again. Or C, but one of those secondary external radiator cooler things.

I mean it's like a REALLY SLOW leak, I've driven with it for 2 months and haven't noticed any real drop on the dipstick, yet every time I look/stick my hand down there it's wet () with pink fluid (underneath the air dam).

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Old 10-12-2014, 07:26 PM   #2
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Default Re: Small transmission fluid leak from radiator transmission cooler line

Back off the nut, wrap 1.5 turns of ptfe - teflon plumbers tape & tighten down....I don't think I would EVER use a pipe wrench on that tube tho.

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Old 10-13-2014, 09:24 AM   #3
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Default Re: Small transmission fluid leak from radiator transmission cooler line

Thanks, I'll try it. Yeah I'm a fire sprinkler contractor so I know my way around a pipe wrench, it was just to hold back gently. Didn't damage anything.

Should I expect to lose a lot of transmission fluid when I disconnect the line? That was the one reason I've been putting off doing anything about it. Will it drain the whole transmission.

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Old 10-13-2014, 11:32 AM   #4
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Default Re: Small transmission fluid leak from radiator transmission cooler line

Well, I wouldn't think it would be much. About the same as when you recently replaced the radiator. You are sure they are not cross-threaded?

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Old 10-13-2014, 06:14 PM   #5
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Default Re: Small transmission fluid leak from radiator transmission cooler line

Yeah im sure they weren't cross threaded. When I replaced the radiator I also did a transmission fluid change so the transmission was empty. Hopefully it isn't much.

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Old 10-13-2014, 06:55 PM   #6
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Default Re: Small transmission fluid leak from radiator transmission cooler line

I changed my Rad and Trans Fluid and Engine Oil 6 weeks ago. A week before, I started soaking the trans lines with PB blaster. Top one, easy, no problem. Bottom one broke. The garage where my tools and compressor is 1-1/2 hours away (friends place, long story) and I was screwed, as there was nobody around, and the nearest place was 20 minutes away, and as the house is in Podunk, the chances of them having a lower trans line was Slim and None. Slim just jumped on his ATV and took off, BTW. I mickey moused an air fitting that the thread was close, and clamped a rubber hose to it, and the part of the existing line that was still OK. I went up and changed the Oil again this week( I do a lot of miles), and noticed a wet spot at the bottom of the rad underneath the lower cooling line. No Drip, just a little wet. Checked the fluid once it was back on the ground, and it showed right full. Drove for 45 minutes, checked it again, and it was just a hair above full. I know I have to replace the line, but it's held great for 5000kms, so I'll wait until the spring. It's already Cold here in the Great White North.

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