Title says it all, I have a badly leaking non-serviceable service valve on the high side. I checked the usual sources and nothing.

 

On my 1994 V12, the valves are standard GM style parts that screw on. I'd take a closer look! That being said, an AC shop should be able to make up new hoses.

 

These are sadly 1st generation 134a ball valve style soldered right to the hard line. AC is probably the only way.

 

I thought they were hard attached at first on the V12 hoses too, but it turned out they were not. As I mentioned, standard GM style fittings with the ball inside instead of a shrader valve..

 

Well, then I’ll have another look.

 

The high side insert. You're looking for the joint right under the quick connect groove.
I think it's AC Delco number 155438

 

Spot on. I removed the low side fitting and the 5lbs of pressure in the system shot that ball valve across my garage into oblivion. I will have two new valve-core style fittings here tomorrow thanks to another post here with the O'riely part numbers. Then a quick vac down and recharge. I suppose I should have put my recovery machine on it but I really thought it was empty.