Matt
Another thought occurs; when your aircon comes on by demand, the compressor spins using an electromagnetic clutch. These can burn out or seize. It could be what is causing your clicking.
Check out if it's working. Get someone to switch on the AC in the car while you have the hood up. Check does the pulley on the compressor spin when it should. If it does not, that could be the problem.
Hopefully you have not seized up the compressor through running with low gas/no lubricant.
Joe
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