Agree. I talked with several sources about the York compressor working with 134, and the general consensus I heard was that the York compressors wouldn't work properly with the smaller molecule size of the 134 and that the higher pressures you run with 134 would eventually lead to compressor failure. I did switch our '66 over to a Sanden. Is it correct for a restoration? No. But if you're not going for an exact restoration and want your air to work, go with the Sanden.

 

Hey guys I stuck r-134a into the system. Because the car is new to me i dont know how well the r-12 performs, but the r-134a works pretty good from what I am experiencing. Again its not a mercedes ac system but it gets the job done with r-134a.