My 1986 PORSCHE has R12 can I add 134a into the system or do I need to vacuate? on 1990 Porsche 944

I have guages and am mechanical inclined, do I need to evacuate the system or can I add the 134a with the R12?

by in Tulare, CA on August 23, 2012
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1 answer
ANSWER by , August 23, 2012
Need to change ovet to R134A per service manual. Don't mix them.