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Jeep Wrangler YJ
YJ General Discussion
1990 YJ A/C pressure valve
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<blockquote data-quote="Flyer58" data-source="post: 440738" data-attributes="member: 18629"><p>Yeah it depends on who you talk to about the differences. An engineer in car AC design will tell you the valve for 134a has a slightly larger orifice than R12 because of the molecule size and higher pressures. </p><p></p><p>My limited sources have said they switched refrigerants without seeing any difference, but that's after a beer or 2,3,4, so I don't know. </p><p></p><p>Everyone agrees the two oils are not compatible and the system must be flushed clean before adding 134a and always install a new filter/drier. This means making sure there's no oil inside the compressor.</p></blockquote><p></p>
[QUOTE="Flyer58, post: 440738, member: 18629"] Yeah it depends on who you talk to about the differences. An engineer in car AC design will tell you the valve for 134a has a slightly larger orifice than R12 because of the molecule size and higher pressures. My limited sources have said they switched refrigerants without seeing any difference, but that's after a beer or 2,3,4, so I don't know. Everyone agrees the two oils are not compatible and the system must be flushed clean before adding 134a and always install a new filter/drier. This means making sure there's no oil inside the compressor. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
1990 YJ A/C pressure valve
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