A/C Compressor

A/C Manifold and Tube Leak Test

1. Tighten A/C manifold and tube retaining bolt to 18-23 Nm (14-16 lb-ft).

2. Add refrigerant to the system if necessary.

3. Leak test the o-rings using Rotunda R-134a Halogen Leak Detector 161-R0010 or equivalent.

4. If no leaks are found, the o-rings are good.

5. If a leak is found at the A/C manifold and tube (19D734) and the A/C manifold and tube retaining bolt is tightened to 18-23 Nm (14-16 lb-ft), install new o-rings as outlined. Then repeat the leak test.

External Leak Test

NOTE: It may be necessary to remove the A/C compressor (19703) from the vehicle for this test.

1. If the A/C compressor is on the vehicle, discharge the system following the recommended service procedure.

2. Remove the A/C manifold and tube attaching bolt and remove the A/C manifold and tube from the rear head of the A/C compressor . Install Rotunda Pressure Test Plate T94P-19623-E on the rear head of the A/C compressor using the existing A/C manifold and tube retaining bolt.

3. Connect the high and low pressure lines of a manifold gauge set to the corresponding fittings on the Pressure Test Plate.

4. Attach the center hose of the manifold gauge set to a refrigerant container standing in an upright position.

5. Rotate A/C compressor shaft 10 complete revolutions to distribute oil within A/C compressor .

6. Open the low pressure gauge valve, the high pressure gauge valve and the valve on the refrigerant container to allow the refrigerant vapor to flow into the A/C compressor .

7. Using Rotunda Leak Detector, check for leaks at the A/C compressor shaft seal and the A/C compressor center seal.

8. If a shaft seal leak is found, install a new shaft seal following the procedure given in in Section 12-03B. If an external leak is found at the center joint of the A/C compressor , install a new A/C compressor assembly.

9. Reinstall the A/C manifold and tube , leak test, evacuate and charge system as outlined. Observe all safety precautions.

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 drag is suspected.

1. Remove refrigerant from the system following recommended service procedures. Observe all safety precautions.

2. Remove refrigerant hose and A/C manifold and tube assembly from A/C compressor . Use care not to allow dirt to enter A/C compressor .

3. With the A/C clutch (2884) disengaged, rotate the A/C compressor shaft and note the torque required to rotate the shaft one complete revolution. This is not the starting torque.

4. If the rotational torque exceeds specification 9 Nm (7 lb-ft), replace the A/C compressor assembly.

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.

6. Check the system for proper operation.