How do I figure out the correct amount of R134 to put in a R12 system?

1992 FORD E-SERIES VAN
100,000 MILES • 6.7L • V8 • 2WD • AUTOMATIC
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JOE IANNIELLO
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A/C system has been converted from R12 to R134. It's now weak. I wish to do a fresh recharge, with R134. I plan on evacuating whatever R134 is in the system. How do I figure out the correct amount of R134 to put in a R12 system? Thanks

Ford dually, Winnebago.
Sep 21, 2024 at 7:43 AM
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STRAILER
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Oh yes, the old conversion. the r12 conversion will work slightly less with 134a that is just h way it is but if you follow this video, you can make it as cold as it can be.

https://youtu.be/4EqdrBVb0sY?si=34p5EDU6emMG59FT

Please go over this guide and get back to us.
Sep 22, 2024 at 10:15 AM