Go to a independent Porsche shop or a shop the specializes in A/C. Doing it at home like flaps10 said is easy but if your system is not working properly you may want to have it looked at. These cars are getting up there in age so you may have a small leak. Good luck.
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03 Carrera
02 Boxster S Guards Red, black interior with matching hardtop
89 Carrera 4
89 944 S2
78 911SC
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