Ok so im new here, hope this is where this goes. Had my truck a few years now, and its starting to really throw crap my way. Temps started going wild last night but it was cold so it didnt overheat. Checked today and saw this fitting coming out of the top drivers side of the radiator and im not sure what its called or if its hard to replace. Im not sure its the only leak, but radiator was basically empty and its soaked from the fitting on down so its certainly an issue. Any help anyone could give me it would be great.
Thanks,
Jayk

 

Welcome to the forum.
Can't really tell from the picture but it looks like an A/C or a hydraulic lin.

 

A/C lines do not go into the radiator.

It's probably the heat exchanger for transmission fluid. I don't think it's replaceable. If it's bad you may need a whole new rad.

 

i didnt think heat exchangers needed high pressure fittings. but anyway its not coolant that goes through it. you have another issue thats causing a coolant leak

 

Probably time for a new radiator

 

It's a light duty crimp fitting. To me it looks like the kind that GM uses one the engine oil cooler lines (65 psi max. But they still leaked on me). But I've only ever seen engine oil go to a separate cooler. Not into the rad.

A/C condensers are usually separate, and so are power steering fluid coolers (much higher pressure).

The GM transmission fluid cooler lines I've seen have quick disconnect fittings with a circlip. ATF line pressure varies between 50-160 psi.

 

On my 93 sub the trans lines go to the passenger side of the radiator and the oil cool lines hook to the driver' side. If the lines leak they should leak trans fluid or oil, not antifreeze.

 

the lines are in direct contact with the coolant, so it could be leaking AROUND the fitting.