Compressor HVAC: Testing and Inspection
External Leak Test1. Key ON, engine running.
2. Turn the A/C system ON.
3. Using a Rotunda R-134a Automatic Calibration Halogen Leak Detector, 023-R1003 or equivalent, 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 bolt heads for leakage.
5. After checking the compressor for leaks, turn the A/C system OFF.
6. Key OFF.
7. If an external leak is found at the A/C compressor case, replace the A/C compressor.
If a new bolt is installed and the A/C compressor still leaks, replace the A/C compressor.
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 the 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 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 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 hose and manifold assembly and leak test, evacuate, and charge the system.
6. Check the system for proper operation. Service and Repair