97 tahoe with 225k miles.
I have a coolant leak on the drivers side end cap of the radiator.
It looks like there are two high pressure oil cooler lines that thread into this side of the radiator just under the top radiator hose. I have snugged the top hose but the leak appears to be coming from the ports that these oil cooler lines thread into.
Are these ports replaceable or do I need to repair/replace the radiator.
Thanks for any help

Think you'll need a new rad. I believe there are hex fittings that screw into the rad...flat metal pieces with small hex flats that the tranny oil lines screw into. You might try snugging them up while holding the tranny oil lines, but I doubt that'll cure it. Those are plastic endcaps, not like the old brass ones where you could just replace the top tank. I'd also check to make sure the coolant and transmission fluid didn't mix together...oily sheen on the surface when you open the rad cap. Hope this helps!

Replace the radiator! You can try all kinds of band aids but the real and definite fix is replacing it.

I agree,a new radatior and transmission line fittings are a jiffy tite fitting which have a huge advantage over flare nut fittings: do not leak and much easier to remove.There is a special release tool to get the line off,the 3/8 relase tool,same with the eingine oil lines too (if it has those) which have jiffy tite fittings.The engine oil lines use the 1/2 release tool.All you do is pop off the plastic cover just enough,put the tool in making it is fully seated and turn 60 degrees which the line will come off.GM started using the jiffy tite fittings in 1996 and I like them because they do not leak and take less time to remove with the special tool.

Just noticed the same problem with my '98. Seems to be an intermittent static leak tho. Is replacing the radiator a doable job at home? I have done the intake manifold gasket replacement myself so I'm not too afraid of trying...just what kind of special tools may be needed? Tricks?
Thanks for the help.

Definitely doable. I'd suggest removing the fan assembly to give you more room and one of those big flat drip pans to catch all any leftover coolant and tranny fluid. I'd also suggest replacing the hoses, t-stat as well since you've got it all apart and easy to access.

No real special tools except maybe a big crescent wrench and a hammer to loosen the fan assembly...though I will suggest a big piece of cardboard to put between the new radiator and fan while screwing it back on, just in case. Just don't forget to remove it before reinstalling the fan shroud.

The special release tools for the Jiffy tite connectors are a must for this job,the 3/8 release tool for the transmission lines and the 1/2 release tool for the oil lines.The special release tools for the jiffy tite connectors are not cheap,I paid $28.00 for the 3/8 release tool from my Cornwell dealer and the 1/2 release tool is $30.00 which I ended up buying the rest of the kit from my Cornwell dealer

Sorry to hi-jack the post. Any one have a good source for the rad? Anyone to avoid? I keep reading to go with AC Delco/OEM. Are all 5.7 '98 radiators the same or are there variants?

Thanks to all for the replies.
I replaced the radiator and upper & lower hoses; took about three hours.
Radiator came in two days from RadiatorBarn.com; cost was $145 delivered.
Tbruz