Ok. So, twice now, I've had the A/C system in for "flush, check for leaks, and re-charge". And both times, it leaves the dealership with the A/C system blowing icy-cold air. A few days later, it's "cool" air....and within a week or so, I have nothing - no fans, no pressure in the system.
(Backing up a bit, I got the car with non-functioning A/C; doing a 2L gas --> ALH swap, I disconnected everything and replaced the line from the firewall to compressor, as well as dryer (new) and condenser (used).
First time it was a bad o-ring - I'd replaced the dryer and as mentioned above, the re-attachment process did not go smoothly and ended up pinching the o-ring.
So, back it went to VW where the tech replaced o-rings any place there was dye leakage that was visible, pressure tested, pulled vacuum - both of which held as expected. And again, the system went from perfect function (super-cold) to "meh-cool", to nada and no refrigerant.
So...
what's the next step? When the refrigerant is present, the system works (seemingly) perfectly. Where could I be losing it - no dye splotches after the second fill like there was after the first one, at any connection points or any refrigerant lines I can see in the engine compartment or on the condenser.
Even if the dryer was "dead", that wouldn't lead to loss of R134a, would it? I'm $700 into this at VW, so don't really want to go back for a re-charge until I know that the leak isn't leaking anymore.