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Start with manifold gauges to see if there is enough static pressure to activate the switch to kick in the clutch.
If it is getting power to the clutch then an enlarged from wear air gap can cause the clutch to not engage. If the gap is too large, you can remove the center bolt and clutch disc. After removal of just the disk, inside there will be a shim that you can remove to lessen the gap. Remove shim, reassemble, and recheck the gap. Retest.
Clutch coils can go bad but usually at that point I recommend replacing the compressor, drier, and orifice tube. Also keep in mind wiring issues and pressure switches (high & low) can also go bad.
The reason your charge did not help; there is air in the system. Air is the enemy of an AC system’s efficiency. You need to hook up a vacuum pump through a set of AC gauges to the low pressure side and pull a vacuum for about 30 minutes. Shut the gauge valve and turn off the vacuum pump. Let set for another 30 minutes to see if you loose any vacuum. You probably will. Got to fix the leak before charging. You will need to take to a shop so they can put dye in the system to find the leak. If you don’t, you are throwing money away. Probably cost about $150-$200 to charge, depending how much R134a you need. I just had my X done. I have to get it done every 3-4 years. I have a very small leak around the compressor shaft seal.
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