Help with vintage air

[jblaine86]

Ok I got frustrated with charging my vintage air system in my Camaro so I took it to a shop to have it charged. They said they were able to charge the system but the ac clutch wasn't in gauging. They said I wasn't getting power to the binary switch. When I got home and checked the power lead to the switch the where correct. I found I had not the connector out. Now, I have power getting to the binary switch but clutch still will not turn on. Wire is good going from binary switch to compressor, but it seems like the binary switch isn't working. How do I test the switch? Also, can I remove the switch without loosing the refrigerant?
Thanks,
Jon