You can install a saddle, weld it on with the refrigerant in the system with no problem.

Dont listen to all of the naysayers who say it's "impossible" or "dangerous"

 

Thanks Six, I don't think a saddle will help, as I can't visualize how to puncture it with the switch welded on the other end. I think I can weld it without damaging anything..:cheers:

 

Can you ad a flair T on the service valve and mount it there?

 

The only functional service valve on the high side is outside the case. There is one inside but it has a cap or a nut on it like I have never seen before, and it is in an AWKWARD location.

 

Is it a ball valve or king valve? I have put a lot on this way. Pump down,remove core and ad flair T with schrader for service port ad pressure switch and you are done

 

update

Mixed results on my attempt with the pinch off tool. Unsuccessful overall, as I was apparently unable to completely pinch off and isolate the stub...Pinhole leaks, but leaks still the same... On the positive side, the heat from welding was not a problem whatsoever, I will not hesitate to weld on a charged system and I would not worry about the heat, as it can easily be contained...:cheers:

I kind of knew something would go wrong because EVERY time I try to do a cheaper repair for a customer rather than doing the thorough and complete, comprehensive text book repair, for some reason I end up fighting it..There is another lesson to be learned form that..

Thank you for your advice and for giving me the confidence to try it, and learn from this experience.

 

Mixed results on my attempt with the pinch off tool. Unsuccessful overall, as I was apparently unable to completely pinch off and isolate the stub...Pinhole leaks, but leaks still the same... On the positive side, the heat from welding was not a problem whatsoever, I will not hesitate to weld on a charged system and I would not worry about the heat, as it can easily be contained...:cheers:

I kind of knew something would go wrong because EVERY time I try to do a cheaper repair for a customer rather than doing the thorough and complete, comprehensive text book repair, for some reason I end up fighting it..There is another lesson to be learned form that..

Thank you for your advice and for giving me the confidence to try it, and learn from this experience.

Maybe brazing a schraeder stub on, then installing a flare-type HPC.

:.02: