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What year car? Also plan on replacing other things like the drier, and the two rubber hoses. The o-rings really should be replaced to and the expansion valve. Make sure you give the system a good flush to, and if you like the environment bring it to a shop to have the old refrigerant recovered.
Current:
2016 Cayman S
Former:
94 968 Cab 6 Spd. Black/Cashmere D1R SC
86.5 928 Garnet Red Metallic
Posts: 1,770
Threads: 77
Joined: Jul 2006
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The 911 world seems to use Griffiths a lot, they have a whole kit that includes everything and newer updated style compressor.
http://www.griffiths.com/porsche/ac/944ac/index.html
I haven't replaced the compressor in my 968, I swear it makes more noise then it is suppose to but haven't compared it with anyone yet. But I have done the compressor in my 928, for that one I actually got a rebuilt unit off of Ebay, and have had good luck with it.
Current:
2016 Cayman S
Former:
94 968 Cab 6 Spd. Black/Cashmere D1R SC
86.5 928 Garnet Red Metallic