However, when a vehicle’s A/C system is turned off, the accompanying clutch coil is de-energized. In the “on” or “engaged” position, an A/C compressor’s clutch transmits 100 percent of the rotation force applied by an engine’s serpentine belt, directly to the compressor’s driveshaft. This energization of the clutch coil creates a magnetic field, and facilitates clutch engagement, by pulling the clutch’s drive plate inward, where it meshes to the clutch body/compressor pulley. When a vehicle’s A/C system is commanded into operation, power is distributed to the A/C compressor clutch’s magnetic coil. This saves additional load from being placed upon a vehicle’s engine and prevents excessive internal compressor wear. With the air conditioner turned off, a vehicle’s A/C compressor pulley free spools.Īs a result, no rotational force is applied to the A/C compressor’s driveshaft.
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