## Air Conditioning

#### Compressor Clutch Check

21-89

1. Check the armature plate for discoloration, peeling, or other damage. If there is damage, replace the clutch set (see page 21-90).

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 (see page 21-90).

3. Measure the clearance between the rotor pulley (A) and the armature plate (B) all the way around. If the clearance is not within specified limits, remove the armature plate (see page 21-90) and add or remove shims as needed to increase or decrease clearance.

   Clearance: | 0.5 + 0.15 mm (0.020 + 0.006 in.)

NOTE: The shims are available in four thicknesses: 0.1 mm, 0.2 mm, 0.4 mm, and 0.5 mm.

4. Release the field coil connector from the holder, then disconnect it. Check the thermal protector for continuity. If there is no continuity, replace the thermal protector (see page 21-92).

NOTE: The thermal protector will have no continuity above 122 to 128°C (252 to 262°F). When the temperature drops below 116 to 104°C (241 to 219°F), the thermal protector will have continuity.

5. Check resistance of the field coil. If resistance is not within specifications, replace the field coil (see page 21-90).

   Field Coil Resistance: | 3.05 - 3.35 ohms at 20°C (68 °F)