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

Tiny
JOE IANNIELLO
  • MEMBER
  • 1992 FORD E-SERIES VAN
  • 6.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
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.
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Saturday, September 21st, 2024 AT 7:43 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,345 POSTS
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.
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Sunday, September 22nd, 2024 AT 10:15 AM

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