Check the armature plate (A) for discoloration, peeling, or other damage. If there is damage, replace the clutch set.
2.
Inspect the friction surfaces and the compressor shaft hub for excess oil. If excess oil is present, and it is not from the engine or power steering system, then the compressor shaft seal is leaking. Replace the A/C compressor.
3.
Check the pulley (B) bearing play and drag by rotating the pulley by hand. Also check for grease leakage from the bearing. Replace the clutch set with a new one if it is noisy, has excessive play/drag, or has bearing grease contamination on the clutch faces.
NOTE: The pulley and the armature plate were mated at the factory by a burnishing operation. Always replace the pulley and the plate as a set. Replacing only one part of the clutch set will cause clutch slippage.
4.
Measure the clearance between the pulley (A) and the armature plate (B) all the way around. If the clearance is not within specified limits, remove the armature plate and add or remove shims as needed to increase or decrease clearance.
Clearance: 0.35?0.65 mm (0.014?0.025 in)
NOTE: The shims are available in four thicknesses: 0.1 mm, 0.2 mm, 4.0 mm, and 0.5 mm.
2.
A/C Compressor Clutch Thermal Protector - Check
1.
Check for continuity between the A/C compressor clutch connector terminals No. 2 and No. 3. If there is no continuity, replace the thermal protector.
NOTE: The thermal protector will have no continuity above about 122 to 128 °C (252 to 262 °F). When the temperature drops below about 116 to 104 °C (241 to 219 °F), the thermal protector will have continuity.
3.
A/C Compressor Clutch Field Coil - Check
1.
Disconnect the connector (A).
2.
Measure the resistance of the field coil. If resistance is not within specifications, replace the field coil.
Field Coil Resistance: 3.35?3.65 ? at 20 °C (68 °F)
