Rotating Torque Check

NOTE: It may be necessary to remove the A/C compressor from the vehicle for this test.

The rotational torque of a used A/C compressor should be checked if excessive A/C compressor drag is suspected.
1. Remove refrigerant from the system following recommended service procedures. Observe all safety precautions.
2. Remove the refrigerant hose and manifold assembly from the A/C compressor. Use care not to allow dirt to enter the A/C compressor.
3. With condenser to evaporator tube disengaged, rotate the A/C compressor shaft and note the torque required to rotate the A/C compressor shaft one complete revolution, not 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 the specified rotational torque, excessive drag does not exist in the A/C compressor. Install the refrigerant hose and manifold assembly and leak test, evacuate and charge the system.
6. Check the system for proper operation.