RETROFITTING FREON A/C SYSTEM TO REFRIGERANT R134 

Contributed by: Ray Calvo (From Porsche technical bulletin)

As of January 1, 1996 the production of Freon (R12) is no longer permitted.  All Porsche as of the 1993 model year have used the more benign refrigerant R134a.  Owners of older Porsches, however, can usually convert their R12 systems to the new R1234.  The following is what is needed for the conversion (besides the R134a):

944, 944S, 944 Turbo, 924S, 968 from 1985 through 1992:
911, C2/4, from 1984 through 1992:

New receiver/dryer, new O-rings, new high and low pressure charging valves

(Note: from what I have found out, only authorized repair shops will be allowed to buy R134a.   So, if you are tempted to buy the A/C charging blocks sold in J. C. Whitney and do the work yourself, you should forget it.)
 

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