Reached out to them (Eaton) via their web site. Never got a reply.

Hi all, About 3 years back I redid the AC on my '74 Porsche 914. Flushed everything, new compressor and other bits, redid all of the hoses and fittings with aeroquip components. Held vacuum great for over a month. Blows ice cold. Kept it as R12. Fast forward approx 3 years later, not blowing cold. N...