Transmission cooling line adapter?

[huntster]

Trying to hook up a tube to the return line from the transmission cooler to flush the transmission. Could anyone please identify the correct fitting to go from the female threads on the radiator to a male hose connection?

The standard GM one from the auto parts store I had did not thread in (too fine and a flared connection).

 

[huntster]

Searching another site it appears it MAY be a 6 AN fitting? https://www.amazon.com/Russell-670300-Anodized-Aluminum-Fitting/dp/B000CPATK4

 

[swathdiver]

Trying to hook up a tube to the return line from the transmission cooler to flush the transmission. Could anyone please identify the correct fitting to go from the female threads on the radiator to a male hose connection?

The standard GM one from the auto parts store I had did not thread in (too fine and a flared connection).

I think if you take out the threaded insert you're going to introduce coolant into your transmission cooler and visa versa. Just get some 3/8" OD vinyl tubing like Home Depot sells and stick it in the hole after you take out the transmission cooler line the right way, by using either a pic or 3/8" Jiffy Tite connector to remove the fitting by spreading the retaining clip apart.

If you were to remove both threaded inserts in the tank, the internal cooler would fall inside the tank.

 

[915_Tahoe]

you have the last 8 of your vin#, i can get you the gm#

 

[huntster]

I think if you take out the threaded insert you're going to introduce coolant into your transmission cooler and visa versa. Just get some 3/8" OD vinyl tubing like Home Depot sells and stick it in the hole after you take out the transmission cooler line the right way, by using either a pic or 3/8" Jiffy Tite connector to remove the fitting by spreading the retaining clip apart.

If you were to remove both threaded inserts in the tank, the internal cooler would fall inside the tank.

Could you help me understand better how this line fitting is connected? I removed the line fitting that is attached to the stainless line (that then transitions for a bit to rubber) to try to attach my adapter - I removed the male fitting which has an integrated washer on it and the female connection stayed attached to the radiator, but the fluid which leaked out appeared rather 'watery'. I don't understand how that would be possible. I re-attached the line and it threaded in ok. Please advise if I have any major issues to worry about.

 

[huntster]

Could you help me understand better how this line fitting is connected? I removed the line fitting that is attached to the stainless line (that then transitions for a bit to rubber) to try to attach my adapter - I removed the male fitting which has an integrated washer on it and the female connection stayed attached to the radiator, but the fluid which leaked out appeared rather 'watery'. I don't understand how that would be possible. I re-attached the line and it threaded in ok. Please advise if I have any major issues to worry about.

I think if you take out the threaded insert you're going to introduce coolant into your transmission cooler and visa versa. Just get some 3/8" OD vinyl tubing like Home Depot sells and stick it in the hole after you take out the transmission cooler line the right way, by using either a pic or 3/8" Jiffy Tite connector to remove the fitting by spreading the retaining clip apart.

If you were to remove both threaded inserts in the tank, the internal cooler would fall inside the tank.

What is the procedure for replacing the transmission cooler lines?

 

[gooffeyguy]

The trans line connection going into the radiator is a quick connect type of spring clip fitting. You remove that wire clip and the line pulls out. Reattach the wire spring clip first and push the line back in and it'll click back together.

Hayden makes an adapter that will click in there and have a hose barb to allow you to attach a hose.

https://www.summitracing.com/parts/hda-397/make/chevrolet/model/avalanche

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[huntster]

Mine definitely threaded in like a nut with a washer on the end of it. I'll take a picture when I get home.

 

[gooffeyguy]

The fitting in the radiator that receives this spring clip screws in

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[swathdiver]

Did you unscrew #1 in this photo with the line still attached?

 

[huntster]

Yes. Mine did not look like gooffeyguy's above. Cover is much thinner and has the 'washer' like above.

 

[gooffeyguy]

Yes. Mine did not look like gooffeyguy's above. Cover is much thinner and has the 'washer' like above.

My pic was one I just quickly grabbed off the internet. Actually of a Corvette, not a truck, but basically the same thing.

You removed the line the wrong way. It doesn't unscrew, it snaps in and held in place by that spring clip

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[huntster]

My pic was one I just quickly grabbed off the internet. Actually of a Corvette, not a truck, but basically the same thing.

You removed the line the wrong way. It doesn't unscrew, it snaps in and held in place by that spring clip

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

Do you think any damage is done? Could you explain the risk of coolant contaminating the ATF? That threaded inlet should be 100% attached to the transmission cooler and not interface with radiator coolant at all imo.

 

[BG1988]

Do you think any damage is done? Could you explain the risk of coolant contaminating the ATF? \

water and oil don't mix

 

[swathdiver]

Do you think any damage is done? Could you explain the risk of coolant contaminating the ATF? That threaded inlet should be 100% attached to the transmission cooler and not interface with radiator coolant at all imo.

If this were my truck, I would change all of the transmission fluid now, before driving it too much. I would then probably flush the radiator and put fresh coolant in there, it's supposed to be done after 5 years or 150K miles anyway.

I almost did what you did once, only I kept reading a little more before doing! hehehe I bought this tool and used it the first time the other day: https://www.amazon.com/gp/product/B00AZW8PDC/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

 

[huntster]

If this were my truck, I would change all of the transmission fluid now, before driving it too much. I would then probably flush the radiator and put fresh coolant in there, it's supposed to be done after 5 years or 150K miles anyway.

I almost did what you did once, only I kept reading a little more before doing! hehehe I bought this tool and used it the first time the other day: https://www.amazon.com/gp/product/B00AZW8PDC/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

I still am not understanding how there’s any path for interaction or mixing of the fluids. How is there a *********** of the radiator water barrier here?

 

[swathdiver]

I still am not understanding how there’s any path for interaction or mixing of the fluids. How is there a *********** of the radiator water barrier here?

If you unscrewed both of those fittings, the transmission cooler in the radiator tank would fall to the bottom of the radiator. When you took it out, you compromised the seal, allowing contamination. I've seen videos that illustrate this before, let me see if I can find them...

 

[huntster]

water and oil don't mix

I know that .... I meant what physical design of the interface between the radiator and the transmission cooler and cooler lines risk cross contamination of the fluids?

 

[huntster]

If you unscrewed both of those fittings, the transmission cooler in the radiator tank would fall to the bottom of the radiator. When you took it out, you compromised the seal, allowing contamination. I've seen videos that illustrate this before, let me see if I can find them...

But I was able to screw it back in ... nothing 'fell' .... do I need to inspect anything? No leaking fluids that I could see ....

 

[swathdiver]

But I was able to screw it back in ... nothing 'fell' .... do I need to inspect anything? No leaking fluids that I could see ....

Brian, the cooler didn't fall to the bottom because you only disconnected one line, right? Did you see the o-ring on the outside of the fitting? You will not see leaking fluid between the inside of the radiator tank and the internal transmission cooler, unless you cut it open.

You said the fluid looked "watery" right?, How about some photos for the fellas here to examine and give you their best opinion?

Well Brian, maybe I'm not looking at this right. Tom, Wes, Steve, Joe what do you guys think?