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I seriously doubt the OP will have any luck getting his A/C working between the EPA fines, nitrogen purchase, no compressed air blowing out the system, OAT numbers and all the other A/C tech trivia. It is near impossible to advise a new guy on A/C work over the web.
If you must flush the A/C system (not a bad idea on a 25+/- year old A/C) use an air brake cleaner antifreeze when flushing out the A/C. It is 99% Methanol with some Benzotriazole as an anti corrosion additive. 32 oz for $7 at NAPA. Fill then blow it out gently with whatever pressure source you may have. A vacuum pump boils off any residual methanol with the residual H2O when I service the A/C system. Disconnect and don't flush the compressor or your new new receiver dryer. Once flushed..add the amounts of recommended A/C oil needed (see the Bentley for oil quantities) for the flushed system components like the hoses, condenser and evaporator as they will be dry.
Just clean up the evaporator best you can without getting any water/soap in the evaporator, A/C hoses, etc, put it back together and pull a very good vacuum for a 4/5 hours. See if the system holds a vacuum overnight. If the system holds vacuum for 12 hours, your good to go.
If not..you have a leak..install some 134A with a UV dye or DuraCool with UV dye, if you think the EPA will bust you for your 134a leak..which has never happened to an individual working on A/C in his garage. (the EPA has revised their recommendations using environmentally friendly hydrocarbon refrigerants lately..whatever..)..get a UV flashlight and some yellow shooting glasses and find your A/C leak.
Once the system holds a vacuum..charge it up and check/post your temps/pressures.
Or, put it back together and have a good Porsche A/C shop check and finish it up.
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