First off I have a 2003 1500HD 4wd 6.0 Vortec


Noticed that the line connector on the radiator was leakng fluid. Tried changing orings and it was still leaking. Went to dealership and they looked it up by vin #.
Every fitting that they showed me was too small on the thread side.
I tried all the auto parts store and no one can seem to match it .


The fitting is located on the drivers side on the radiator. There is one up top and one on bottom.


Dealership said it could be a aftermarket radiator but im not sure. Im stumped.
Every fitting that they gave me had a thread size of 1/4. Mine measures to 7/8. The line is a 3/8 line.


Any help would be appreciated.

 

This is kind of a drastic solution. If I understand you situation correctly, with the correct size that fits the rad. You can buy an inline splice that can step up a line size to match the rad

 

So wait a minute, are you trying to find the threads of the fitting that lives inside the radiator? As in, the threads on the fitting that screws to the cooler that is inside of the plastic tank on the raidiator? Because those threads are probably unique and non-serviceable. You would most likely need to replace the radiator if that's the case. If you're simply talking about where the trans cooler line's nut screws and pushes the line into the radiator, then that could be another story.

 

If it is on the drivers side it should be the engine oil cooler lines! Passenger side is trans cooler lines. Oil cooler line fittings are usually serviceable, along with line fittings for trans lines.

 

Have the dealer try this part #19303965