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Thanks John, I am not a very good welder but do have a friend who is… I will check with him. I’m hoping it is aluminum coated copper as you said… I’m now considering alternatives to this unit including rooftop ac and mini split units. I did find a unit that looks like it would work and my be as much cost/work as repairing this pig… the welder I took it to this morning said the ‘orange stuff’ was old flux and he didn’t want to weld it :-(

Looks like a copper tube to me, a welder is probably not the best choice for this repair. You need an good A/C guy that can solder it. I added service ports to mine with a mapp gas torch and some flux and all was good. I think a little bit of flux on there and a dab of solder is all it needs. Get the fins pulled back a bit so you can clean the copper good and I think it could be repaired. Of course this is all from a distance and from pictures.