AC Compressor - Growling Noise
NO: 24-08-96GROUP: Heating A/C
DATE: May 24, 1996
SUBJECT:
A/C Compressor Noise
MODELS:
1995 (YJ) Wrangler
1995-1996 (XJ) Cherokee
1996 (AN) Dakota (2.5L)
1997 (TJ) Wrangler
SYMPTOM/CONDITION:
A growling noise may be heard when the A/C compressor is running.
DIAGNOSIS:
Operate the vehicle with the transmission in neutral and the A/C system in the normal A/C mode, with the compressor engaged and the blower fan operating at low speed. While listening for the noise, raise the engine speed slowly until 2100 RPM is reached. If the noise is heard, disengage the compressor by turning the A/C system to the heat mode or by depressing the A/C button. If the noise goes away when the compressor disengages, perform the Repair Procedure.
PARTS REQUIRED:
1995 - XJ
1 55037358 Compressor - 2.5L
1 55037359 Compressor - 4.0L
1 55037360 Compressor - 4.0L (Export - right hand drive)
1995 YJ
1 55037359 Compressor
1996 AN & XJ
1997 TJ
1 4883069 Valve Plate
1 4761737 Seal
1 4761825 O' Ring
1 4741705 O' Ring
REPAIR PROCEDURE:
This bulletin involves installing a revised A/C compressor or compressor valve plate assembly.
NOTE:
IN ORDER TO MINIMIZE THE ABSORPTION OF MOISTURE INTO THE A/C SYSTEM, DO NOT LEAVE THE SYSTEM OPEN TO THE ATMOSPHERE ANY LONGER THAT IT TAKES TO PERFORM THIS PROCEDURE.
1. Using the procedures outlined in the appropriate service manual, discharge and recover the refrigerant using approved refrigerant recovery equipment.
2. Remove the compressor.
3. For 1995 model vehicles, install the appropriate compressor listed above and proceed to step 8. Refer to the appropriate service manual for the replacement procedures if your are not familiar with them. For 1996 and later vehicles, proceed to step 4.
4. Remove the six cylinder head bolts from the compressor and remove and discard the valve plate and original gaskets.
5. Align the new gaskets with the pins on the valve plate and assemble the valve plate and cylinder head to the block.
6. Install the six cylinder head bolts and snug them to the block. Tighten the cylinder head bolts using a cross or star pattern to 22-25 ft. lbs. (34 Nm).
7. Install the compressor and related hardware using the new seals listed above.
8. Evacuate the system for 15 minutes. Fill the system with the appropriate amount of refrigerant charge.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No. 24-10-01-96 1.4 Hrs.
Compressor, Replace - 1995 XJ, YJ
24-10-01-97
Valve Plate, Replace - 1996 AN 1.1 Hrs.
1996 XJ, YJ 1.4 Hrs.
1997 TJ 1.4 Hrs.
FAILURE CODE: P8 - New Part