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Re: R-12 to R134a coversion - how much to use?
Posted to HVAC Forum on 5/30/2013

Dave I think this is the formula you are looking for.

Determine the correct amount of R-134a to use. Check the existing label of the vehicle for the R-12 charge amount. Use the formula {(R12 x .9) - .25 lb = R-134a} to determine the correct charge. This can ... Login to read more.