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86 944 Freon Low Side vs. High Side

  • 1986
  • 944
144 000
Heating and Ventilation

I want to add Freon R12 to my ’86 944 but after reviewing multiple service manuals and online searches the location of the low side pressure valve seems to be different.  My car has both low and high side “side by side” which is convenient but neither cap valve has an indicator which is which (picture attached) .   Can you clarify?   Also  after I recharge this system is there any recommendation on alternatives Freon after I use my LAST R12 can.    I have heard of R12 compatibles and a new product called 434b.   Can you make a suggestion?

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