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68 Factory A/C Capacity

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keiken01:
Anyone know  the R-12 charge capacity for a 68 Mustang with Factory A/C?

keiken01:
My research came up with 2 numbers 28 and 30 ounces.  I converted my R-12 to EnviroSafe-12 (ES-12a).  The conversion is 1:3 so I went with the smaller # and effectively 9.33 ounces of ES-12a provides same cooling capacity as 28 ounces of R-12.  Nice thing with ES-12a is there is no flushing or other special system work to be done.  Just seal up the system, I used Air Dry and Pro Seal as a precaution. 

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