XJ-6 L6-4.2L (1983)
Hose/Line HVAC: Technical Service Bulletins
A/C - Diagnosis Repair Noise and Leaks
82-24
A/C Compressor-Diagnosis and Repair of Noise and Leaks
MODEL:
XJ6 Ser. III, XJ-S
DATE: 5/91
ISSUE:
Unnecessary replacement of A/C compressors for complaints of noise and leaks.
ACTION:
If excessive compressor noise exists, check/repair the following items:
^
Compressor drive belt tension.
^
Compressor mountings.
^
A/C hose routing (make sure hoses are not in contact with other components).
^
Make sure the refrigerant charge weight is correct (refer to Section 82 of the Repair Manual for additional information).
^
Make sure the compressor is filled to the correct level with oil. A MAXIMUM of 4 oz. of oil can be added to the compressor without discharging the
refrigerant. Using an oil injector tool (such as Snap-On Oil Injector Tool ACT 111), add oil in 2 oz. increments (refer to the procedure detailed on
page 2).
NOTE:
Low or excessive charge weight or a low compressor oil level will cause compressor noise.
^
Clutch drag or bearing noise (refer to the clutch replacement procedure detailed in in Section 82 of the Repair Manual).
^
Compressors which leak oil or Freon must have the seals replaced as per the procedure detailed in Section 82 of the Repair Manual.
^
Replace the compressor only after checking all the above mentioned items.
NOTE:
All returned compressors must be complete and sealed using the blanking plate provided on the replacement unit.
Procedure for Compressor Oil Injector Tool Usage:
^
Operate the A/C system. Make sure that the system is full of Freon. Refer to Section 82 of the Repair Manual for test procedure.
^
Remove the sealing caps from the high and low pressure A/C charging points.
^
Check that the valve on the oil injector is closed.
^
Remove the threaded end cap from the oil injector and add 2 ozs. of compressor oil. Replace the end cap.
^
Attach the short flexible hose on the oil injector to the low pressure fitting of the vehicle A/C system.
^
Attach one end of an A/C system extension hose to the fitting on the side of the valve of the oil injector. Attach the other end of the extension hose to
the high pressure fitting of the vehicle A/C system.
^
Run the engine at idle with the A/C system operating.
^
Slowly open the oil injector valve until it is fully open. Allow the oil to flow into the compressor for 2 minutes.
^
Close the oil injector valve. Let the engine run an additional minute, then switch off the ignition.
^
Carefully remove the charging hoses from the high and low pressure fittings and install the sealing caps.
^
Check the A/C system for compressor noise. If noise still exists, repeat the procedure once more, adding an additional 2 ozs. of compressor oil.
NOTE:
Never add more than 4 ozs. of oil to the A/C system.
