Transmission cooler line connector size "Solved"

[bowtiegurl]

I bought a Spectra Premium CU2423 radiator through Rock Auto. I need a new upper transmission cooler line connector (quick connect) radiator side but cannot find one that fits or even what size the male side is. I have contacted Spectra and they can't even give me an answer. Does anyone on here possibly know what the size and thread is?
I was able to get the connector part number and size after a week of contacting Spectra daily.
GM Part #19130039
Dorman Part #800-605
The male side of the quick connect is 5/8-18 UNF
Unfortunately my transmission is dead due to the transmission cooler line popping out at the radiator. I have no gears now.

 

[swathdiver]

I bought a Spectra Premium CU2423 radiator through Rock Auto. I need a new upper transmission cooler line connector (quick connect) radiator side but cannot find one that fits or even what size the male side is. I have contacted Spectra and they can't even give me an answer. Does anyone on here possibly know what the size and thread is?

Do you mean the fitting that screws into the radiator that holds the cooler inside the tank from falling down? The hose or pipes push in and are held in place with clips on the 2007-2014 models.

If that is the part (9/16x18 thread), look these up:

Dorman 800619
Hayden 382
Four Seasons 86059

 

[Foggy]

That piece #1 are avail at your local parts stores usually. !!!

 

[bowtiegurl]

Do you mean the fitting that screws into the radiator that holds the cooler inside the tank from falling down? The hose or pipes push in and are held in place with clips on the 2007-2014 models.

View attachment 444213

If that is the part (9/16x18 thread), look these up:

Dorman 800619
Hayden 382
Four Seasons 86059

Yes the side the c clip is in to hold the line. 9/16 is too small, my factory one from old radiator is too small. I have bought several different sized Dorman connectors just for all of them to be too small.

 

[bowtiegurl]

That piece #1 are avail at your local parts stores usually. !!!

They are all too small. I finally found a spec sheet on the Spectra Premium 2423 radiator, it says the female side, which I take as what holds the transmission cooler up, is 5/8-18UNF

 

[Joseph Garcia]

If you find that this is the correct size and it resolves your issue, please add the word "FIXED" or "SOLVED" to your thread's title, to let others who are experiencing a similar issue know that this thread has an identified solution.

 

[bowtiegurl]

If you find that this is the correct size and it resolves your issue, please add the word "FIXED" or "SOLVED" to your thread's title, to let others who are experiencing a similar issue know that this thread has an identified solution.

Done.

 

[soundquest]

I know I am late to the party but am having the exact same problem -- Dorman 800-605 looks almost identical but it is in fact too small. So my question is -- what part number and brand did you end up using that ended up fitting? I am wracking my brain over here as this vehicle is supposed to head out tomorrow on a very long road trip.

 

[Fless]

@soundquest Unfortunately the OP hasn't been on here since Oct 2025.

It might be helpful to post what you're working on. Consider adding your year, make, model, etc. to your signature so it's always there for reference.

Also, if you can determine the radiator make and model, online vendors may have specs. See the link below for the OP's radiator:

More Information for SPECTRA PREMIUM CU2423