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Old 06-23-2019, 11:55 PM   #15
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Actually r134a has a slightly lower pressure that r12.
Only half true. R134a does run slightly lower pressure but only on the evaporator side. The condenser side definitely runs higher pressures. Check any AC temp/pressure chart.
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Old 06-24-2019, 08:52 PM   #16
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Only half true. R134a does run slightly lower pressure but only on the evaporator side. The condenser side definitely runs higher pressures. Check any AC temp/pressure chart.
While I don't have a lot of experience with auto a/c I have 20 years experience with r134a in fridges, walk in coolers, prep coolers, pop machines, walk in freezers, ect. and the high side pressure is never more than a few pounds of the high side of the old r12. So you statement of significantly higher is not true
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Old 06-24-2019, 09:05 PM   #17
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If the system is working ok, then I would not do the switch.. You can purchase original R12 or R12 compatibles on e-bay at reasonable costs, compared to 20 years ago.. (I think I have a couple cans of R12 in the barn...)

..
^^^THIS
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Old 06-24-2019, 11:07 PM   #18
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If the system is working ok, then I would not do the switch.. You can purchase original R12 or R12 compatibles on e-bay at reasonable costs, compared to 20 years ago.. (I think I have a couple cans of R12 in the barn...)

..
X3.
I still have R12 in my '72 Vette. Works great and R12 is still available.
If you go to R134 then you probably should change out your condenser for one that is designed for that. Your original condenser will work, just not as well.
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