Just finished up -- it was either excess oil or a blockage. I flushed the entire high side from condenser to TVX and the evaporator. Replaced expansion valve and receiver drier.

and Success, or about the limit of R134a in my climate!....Definitely either flushed out excess oil or removed any blockage.

I got about 24-26oz estimate in. That is about 6oz short of what the factory manual states, but any higher was outside my comfort zone for pressures. In cooler climates I would have added more for sure. Final pressures 55psi low 375psi high. Ambient temp is 112F. Getting 48F out of the center vents on the quick drive I made. Rises to about 55F at idle. I expect on the freeway it'll get down to the low 40's.

I think that's about the limit of R134a in this climate! Either way it'll last me the rest of the summer and once I put the new evaporator, heater core, compressor RD/TXV and R12 in, I should see even lower vent temps and lower pressures.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k