A couple of years ago I put a Rollguy Sanden system on a w123 including the fan run when a/c on option. I left the car r12. Now it is back in in the shop. With the correct amount of r12 I'm getting vacuum on the lo side of compressor and 150 or so on hi side (ambient 75dF). No cold air, site glass is clear with plenty of air blowing out the dash vents.

My question is, when I got compressor it stated for r134. I worked with the assumption that if I flushed compressor out I could convert it to mineral oil for the r12 operation. Was this a good assumption or no?

I'm still nosing around on this one. I will probably end up getting a p-flow condenser and convert to r134.

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Jim