[kcarlen]

I think that I have found the leak.
It is at the filling low-pressure schrader valve, as other poster's have mentioned.
It is so minute though, i can barely see small bubbles appear over a 10 minute time-frame.
I guess that I need to have this valve replaced....I have read on another thread that these kits can be purchased through auto suppliers.

If I leave my fill quick-disconnect fitting in-place, I can maintain my static pressure in the system, (about 65-75PSI) with the engine turned off for so far a period of 2 days.

The air is now relatively cold, and I have added 3 cans of Duracool, from a 0 PSI state.
On the factory "Duracool" gauge supplied with the fill kit, while the compressor is running the reading is between 28-40 PSI. (Or the Blue range).

Does anyone know if I should be adding oil to this mix, or what is the relative amount that I should be putting into a system with the rear AC components?

Thanks all for the help so far!