My 01S has a slow AC leak. I thought it was fixed last fall when the dye covered expansion valve was replaced. Now, 5 months later, the refrigerant is low. I've taken the car to two AC specialty shops and a Porsche dealer. No one seems to have identified exactly why the car is losing refrigerant.
Can anyone recommend a great AC shop in the San Francisco bay area> Your recommendations are greatly appreciated.
PS: The main reason I'm asking is that I am trying to avoid paying more in diagnostic fees than the cost of the repair. I'm already into this for about $900 inclusing replacing the expansion valve.