An AC compressor clutch is an electromagnetic device that engages and disengages the compressor from the engine crankshaft. When the AC is turned on, the clutch solenoid is energized, which creates a magnetic field. This magnetic field pulls the clutch plate against the clutch hub, locking it in place. The clutch hub is connected to the engine crankshaft, so when the clutch is engaged, the compressor pulley rotates with the engine. This rotation drives the compressor, which in turn circulates refrigerant and cools the air in the car.
When the AC is turned off, the clutch solenoid is de-energized, which breaks the magnetic field and allows the clutch plate to disengage from the clutch hub. This stops the compressor pulley from rotating, which in turn stops the compressor from circulating refrigerant.
The AC compressor clutch is cycling on and off rapidly when the AC is on. This is normal and helps to maintain the desired cabin temperature.
