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There is a relay used to energize the clutch, though its likely not the issue since it does work for a while. Any way you can monitor the AC pressures when its working to see if there is an issues there? Are you good with electrical diag and wire diagrams? I would like to go ahead and rule out a clutch issue. While running, AC on but not working. Use a broom handle and pop the face of the AC compressor clutch to see if it engages. If so then the clutch iar gap is excessive or the coil is weak.
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