What causes AC compressor clutch failure?

Air conditioning.A/c compressor clutch

What are the symptoms of a bad AC clutch?

AC compressor clutch assembly air gap.

Compressors are equipped with an electromagnetic clutch as part of the compressor pulley assembly. The clutch is designed to engage the pulley to the compressor shaft when the clutch coil is energized.

Nearly all clutch assemblies have a clearance specification for the distance between the clutch and the pressure plate.

Compressor air gap out of specifications.

This clearance is measured with a feeler gauge. If the clearance is too great, the clutch may slip intermittently and cause a scrapping or squealing noise. Damage to the compressor and poor ac performance will result from this fault.