Check For Leaks
EXTERNAL LEAK TEST1. Key ON, engine running.
2. Turn the A/C system on.
3. Use R-134a Automatic Calibration Halogen Leak Detector 023-R1003 or equivalent to check the A/C compressor for leaks.
4. Check the A/C compressor front and rear seals, the center housing seal, the shaft seal, the low and high pressure line seals, and around the A/C compressor cylinder bolt heads for leakage.
5. After checking the A/C compressor for leaks, turn the A/C system off.
6. Key OFF.
7. If an external leak is found at the:
^ Thermal protection switch seal, high or low pressure line seals, shaft seal or rear cover seal, service the seal on the A/C compressor.
^ Center seal of the A/C compressor body or the center housing assembly, install a new A/C compressor.
8. Retest the A/C compressor if it was repaired.
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. Discharging and Recovery 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 the 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 Nm (7 lb/ft), replace the A/C compressor.
5. If the rotational torque is less than 10 Nm (7 lb/ft), 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. Evacuation and Charging
6. Check the system for proper operation.