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Freeze-12 is a blend of R134A(80%) and R142B(20%). With that said, one would wonder why not just move to R134A?
Freeze-12 also requires a special tap to install. The supplier of the product(somewhere in Calif) gets about $20-$25 for the special tap. After you do all of the math, the cost isn't justified. If you want R-12 efficiency, stay with R-12. I've read good and bad about Freeze-12.
My 2 cents.
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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