Rotating Torque Check

The rotational torque of a used A/C compressor should be checked if excessive compressor drag is suspected.
1. Recover refrigerant. Observe all safety precautions. Refrigerant Recovery
2. Remove the A/C manifold and tube assembly 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 measure the torque required to rotate the shaft one complete revolution. Do not measure the starting torque.
4. If the rotational torque exceeds 10 N.m (7 Lb-Ft) 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 assembly and leak test, evacuate and charge the system. Service and Repair
6. Check the system for proper operation.