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Disconnect the pressure switch and, with the engine running and the A/C turned to Max, jumper the two connector terminals together. Once the connector terminals have been jumped together, the A/C compressor clutch should come on. If it does, either the pressure switch is bad or you have a low-refrigerant charge. If the clutch doesnt engage, then you have no power going to the pressure switch, or there is a problem between the pressure switch and the compressor clutchmore on that in a minute.