Compressor Clutch Check

A/C Compressor Clutch Check

1. Check the armature plate for discoloration, peeling, or other damage. If there is damage, replace the clutch set.




2. Check the rotor pulley bearing play and drag by rotating the rotor pulley by hand. Replace the clutch set with a new one if it is noisy or has excessive play/drag.




3. Measure the clearance between the pulley (A) and the pressure plate (B) with a dial indicator. Zero out the indicator, then apply battery voltage to the A/C compressor clutch. Measure the movement of the pressure plate when the voltage is applied. If the clearance is not within the specified limits, the pressure plate must be reshimmed.

Clearance: 0.35 - 0.6 mm (0.014 - 0.024 in)

NOTE: The shims are available in three thicknesses: 0.1 mm, 0.3 mm, and 0.5 mm.




4. Check resistance of the field coil. If resistance is not within specifications, replace the field coil.

Field Coil Resistance: 3.9 - 4.3 Ohms at 68 °F (20 °C)