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I'm a little concerned about jumping to the conclusion that low freon is responsible. It sounds like the A/C stopped working from one day to the next. There would have to be a substantial leak for this to happen, or a leak on the high side of the system.
The thing that clicks in and out on the compressor is the clutch. These can go bad. Here are a couple of tests to run to help narrow the problem down:
1) On the silver can (receiver / dryer) close to the firewall, on the passenger's side of the vehicle, there is a black wire harness. This is the connection to the low pressure sensor. Remove this harness and insert a jumper across the two leads. Try to run the A/C and listen for the clutch to engage. If the clutch engages, then you are very low on freon. Inspect for oil spots along the condensor and any of the narrow lines that lead to and from it (again, I'm leaning toward the high-pressure side of the system).
If the clutch does not engage, re-connect the harness to the receiver-dryer and check your fuses.
2) Assuming we still haven't pinpointed the problem, with the A/C controls set to On and the key in the run position (engine off), check for power at the compressor clutch. You'll need a volt meter to do this, and you can remove the two wire harness from the compressor and insert your test leads into it.
If you have power at the clutch and the clutch isn't egaging (am I spelling engaging right or is there a U in it?), then you have a bad clutch.
Good Luck!
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