I can tell you that the later Classics had aircon wiring within the standard loom for both compressor clutch, pressure transducer and dash switch Gary. My Roadster even has the aircon relay installed. Similarly the heater box has external fittings to take the a/c matrix. If the CX also redundant a/c wiring included and compressor fitted it may only require a/c radiator and cooling matrix within heater box for complete working system, as Peter suggests.
