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You should replace the receiver/dryer with new. I would remove the compressor and drain any oil in it, and replace the oil. Just measure what drained out. It should be 2 or 3 ounces. Then pull a long vacuum. A nitrogen purge would be nice. Replace the oil in the vacuum pump, and pull a one hour plus vacuum. Then add refrigerant to just the low pressure side, slowly and turn on the engine and let the compressor run. Check the pressures on the high and low side and and get them to normal pressures for the air temp.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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