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Clutch Assembly

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On the front of the compressor is a belt-driven clutch assembly. The A/C control unit in the dash turns the electric clutch on and off based on whether the A/C is switched on by the driver and based on pressure build in the system. You can check the clutch function briefly by jumping 12 volts to the compressor clutch. If the clutch engages with the jumper but not during normal operation, the A/C control unit is not sending a signal to the compressor or you may have a wiring issue.