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    1. · 92 TURBO
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      1,786 Posts
      I'll let the more knowledgeable give you the definitive answer.. but I think the old R12 seals just wouldn't hold up to R134a. You might be fine with those greens ones for R12 though. I just can't give you a definitive answer.

      @SupraMikeCT, this question seems right up your alley.
      @Woosh10 is correct, the old black seals and O rings will not hold up to R134a refrigerant. The green and the Toyota red O rings will work with either R12 & R134a.


      Green manifold gasket for the MK3's Supra ND 10PA17 compressor manifold when converting to R134a:


      EDIT:
      BTW, I would use Ester oil instead of PAG if I were converting to R134a. Ester oil is more compatable with any remaining mineral oil than PAG oil.
      The desiccant used in new receiver/driers also work for both refrigerants
       
    2. · Registered
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      76 Posts
      Discussion Starter · #20 ·
      @Woosh10 is correct, the old black seals and O rings will not hold up to R134a refrigerant. The green and the Toyota red O rings will work with either R12 & R134a.


      Green manifold gasket for the MK3's Supra ND 10PA17 compressor manifold when converting to R134a:


      EDIT:
      BTW, I would use Ester oil instead of PAG if I were converting to R134a. Ester oil is more compatable with any remaining mineral oil than PAG oil.
      The desiccant used in new receiver/driers also work for both refrigerants
      I want to maintain r12, so I will swap over the seals to green if I have leaks from a vacuum test.
       
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