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In Reply to: A/C freon??? posted by Ngoc on May 31, 2001 at 13:15:41:
Freeze 12 is a blend of 80% R-134a and 20% R-142b. It cannot be used to "top-off" an R-12 charged system. If your system does not need repair and is just a little low, just add more R-12. There are a lot of things to consider if you need to retrofit the system and in doing so you would have to recover the R-12 first.