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The most common cause of an AC compressor not engaging is a low refrigerant charge. You need a shop to evac and recharge the system adding some uv dye. The machine will also put a vacuum on the system and if there is a major leak it will be detected. You should also check the ac compressor fuse and relay. Check for voltage at the ac compressor with the ac switch turned on. If you have voltage you need to replace the compressor clutch.
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