The expansion valve is probably the faulty part(however, receiver dryer installed backwards exhibit the same symptoms). The expansion valve is accessed by removing the wiper blade and removing the plastic cover over the blower motor(below and fwd of the windshield, under the hood.)It is a standard A/C expansion valve no need to get a Porsche specific valve. The A/C tubing putty can be purchased at most auto partts stores. Do a search hear for "expansion valve" ther were once, detailed instructions on removal and replacement of the expansion valve, located in the area of the blower motor on the right side.
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