1990 Porsche 944 Q&A

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

I have guages and am mechanical inclined, do I need to evacuate the system or can I add the 134a with the R12? -
Answer 1
Need to change ovet to R134A per service manual. Don't mix them. -