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New Drier, All new o-rings, Ester Oil, R134a charge port adapters .. that is the basic.
If the compressor has high miles, ie. over 100k then consider a new Denso.
Visual inspection of hoses over engine.
Evacuate, charge with 134a, test and check for leaks (sniffing the vents with an electronic leak detector is a must).
If you are thinking of 'flushing the system', expect to spend a full weekend; it's not easy to flush a 964/993 system. I would inspect the compressor oil for signs of contaminants or debris before I would even consider flushing this model.
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