Hello,
My radiator cracked at the tank and I bought a replacement radiator. I got it off of genesisautoparts.com There were two available, 1 and 2 row. I figure why not pay a bit more and get a more efficient radiator. I got via FedEx and took it out and noticed 2 AN fittings on it that are not on my old radiator, the rest match perfectly.
Here is a picture of what I'm talking:
Old radiator:
New radiator:

I filled up the new radiator with water and it wasn't leaking from the 2 extra fittings, it seems the 2 row in the radiator is separated. So I'm pretty sure those are for extra component cooling, like power steering or engine oil.

My question is, if I can't return this one for a regular 1 row radiator, can I just keep this one and do I need to weld/plug those fittings securely?

 

I think those are for the trans lines. My 1996 has two trans lines running to the passenger side. I guess you could just cap those off.

 

Thanks, looks like it. A couple of people on ls1.com forum also said it's for automatic transmission.

They also said, all aftermarket radiators come with that so I guess I'll just plug it up.

 

it's for the automatic tranny fluid

nothing to worry about. plug it so nothing gets in there i guess.

 

Replacement radiators often have the transmission cooler so that they don't have to go to the expense of supplying a separate model. One radiator fits all. The fittings are ignored on a manual transmission car.