AC Compressor Help

[Johnb]

Compressor in the 57 not working. Normal seal issue with no way of repairing according to Jack at Markii Enterprise. My car will not be a show, but it will be very nice and i want it to have a/c. I plan on changing out with the York compressor. Need help on the the 3 lines on the compressor that is on the car at this moment. One is high pressure, the 2nd low pressure, what is the 3rd line and its function? Also will the York compressor have the 3 lines.
Please Help
JohnB in Charlotte NC

[Blaroche]

The third small line, if I recall correctly, is an oil return line for the compressor. Our 66 and 67 Continentals both use the York compressor which do not have or need that return line. They just utilize the high and low pressure lines.