Compressor HVAC: Testing and Inspection
ROTATING TORQUE CHECKThe rotational torque of a used A/C compressor should be checked if excessive drag is suspected.
1. Recover the refrigerant from the A/C system. Observe all safety precautions.
2. Remove the A/C manifold and tube from the A/C compressor. Use care not to allow dirt to enter the A/C compressor.
3. With the A/C clutch disengaged, rotate the compressor shaft and note the torque required to rotate the shaft one complete revolution. Do not measure the starting torque.
4. If the rotational torque exceeds 10 Nm (7 ft lb) replace the A/C compressor.
5. If the rotational torque is less than specified, excessive drag does not exist in the A/C compressor. Install the A/C manifold and tube and leak test, evacuate and charge the system.
6. Check the system for proper operation.