Air Conditioning (AC) Compressor Clutch

When battery voltage is applied to the A/C  compressor clutch field coil, the clutch disc and hub assembly is drawn toward the A/C  clutch pulley. The magnetic force locks the clutch plate and hub assembly and the A/C  clutch pulley together as one unit, causing the compressor shaft to rotate with the engine. When battery voltage is removed from the A/C  compressor clutch field coil, springs in the clutch plate and hub assembly move the clutch plate away from the A/C  clutch pulley.

An A/C  clutch diode is integrated into the coil. For A/C  clutch field coil circuit spike suppression.