Does anyone have access to an A/C wiring diagram or schematic (or even any helpful info) about the late model 240 A/C system? I'm talking about the one with a single button, not a rotary dial.

Currently, my '75 has just random bits and pieces of an AC system and I would like to build one of the later model ones into the car, as I hear they cool better when running R134a. It also seems pretty simple, as far as I can imagine. My guess is that the switch powers the relay which only turns the compressor on if the pressure switch on the drier lets it?

Also, do any of the 240 AC systems use an orfice tube? I don't see the part listed on FCPGroton.

Thanks,
Phil