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My 1986 PORSCHE has R12 can I add 134a into the system or do I need to vacuate?

(1990 Porsche 944)
in Tulare, CA on August 23, 2012
I have guages and am mechanical inclined, do I need to evacuate the system or can I add the 134a with the R12?
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Popular Answer
on August 23, 2012
Need to change ovet to R134A per service manual. Don't mix them.
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