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I am not sure why you are retrofitting to 134. Is your system empty today? If it is then it has been exposed to atmosphere, and will require a new receiver/dryer unit. And if you intend to open the system then do the retrofit correctly, and then get new 134a approved O-rings for the receiver/dryer, and the compressor manifold plate. These are easy parts to change out and will make for a great conversion. Like Grommit said you will also need to vac the system down to zero atmospheres to have it correctly accept a charge. You can get a compressor based vacuum at Harbor Freight for $19.00 that will do the job just fine.
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2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
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