A/C Compressor - Moaning Noise
NO.: 24-25-93GROUP: Air Conditioning
EFFECTIVE DATE: Dec. 31, 1993
SUBJECT:
A/C Related Moan
MODELS:
1993 - 1994 (AS) Caravan/Grand Caravan/Caravan CV
Voyager/Grand Voyager/Town & Country
SYMPTOM/CONDITION:
A moan noise is heard in 1400 - 2000 engine RPM range when the A/C compressor is engaged. This moan is the result of a resonance of components of the vehicle.
DIAGNOSIS:
Operate the engine in the 1400 - 2000 RPM range and engage the A/C compressor. If a moan noise is heard, perform the repair procedure.
PARTS REQUIRED:
1 4773165 Clutch Plate, A/C with Damper Ring
AR 4462924 Shim Package, A/C Compressor Clutch
REPAIR PROCEDURE:
This bulletin involves replacing the A/C clutch plate with one that incorporates a damper ring.
NOTE:
THIS REPAIR MAY NOT TOTALLY ELIMINATE THE MOAN BUT WILL REDUCE THE NOISE SIGNIFICANTLY.
1. Remove the screw attaching the coolant recovery bottle and set the bottle aside to improve access to the front of the A/C compressor.
2. Remove the compressor shaft bolt. A band type oil filter wrench can be placed around the clutch plate to aid in bolt removal.
CAUTION:
DO NOT USE ANY TYPE OF PRYING DEVICE BETWEEN THE CLUTCH PLATE AND THE PULLEY TO REMOVE THE CLUTCH PLATE AS DAMAGE TO THE CLUTCH PLATE OR PULLEY COULD RESULT.
3. Remove the clutch plate. It may be necessary to lightly tap the clutch plate with a plastic hammer in order to free it from the compressor shaft.
4. Remove the clutch shim(s) from the shaft and clutch plate. Reinstall the shim(s) in the new clutch plate.
5. Install the damper ring clutch plate (P/N 4773165) on the compressor shaft.
6. With the clutch plate pressed tight against the shim(s), measure the air gap between the clutch plate and the pulley face with a feeler gauge. The air gap should be .020 in. - .035 in. (0.5 mm - 0.9 mm). Adjust the shim pack if necessary to obtain the proper air gap using shims (P/N 4462924).
7. Install and torque the compressor shaft bolt to 135 - 175 In.Lbs. (15.5 - 19.5 N-m).
8. The shims may compress after tightening the shaft bolt. Check the air gap in four or more places to verify the air gap is still correct. Spin the pulley for the final check.
9. Reinstall the coolant recovery bottle.
NOTE:
BECAUSE THIS REPAIR PROCEDURE REPLACES ONLY THE A/C COMPRESSOR CLUTCH PLATE AND DOES NOT INCLUDE REPLACEMENT OF THE PULLEY, THE CLUTCH PULLEY BREAK-IN PROCEDURE OUTLINED IN THE SERVICE MANUAL MUST BE MODIFIED TO CYCLE THE A/C CLUTCH FIFTY (50) TIMES. OTHERWISE FOLLOW THE PROCEDURE EXACTLY.
10. Perform the CLUTCH BREAK-IN procedure outlined on page 24-18 of the 1993 Van/Wagon Front Wheel Drive/All Wheel Drive Service Manual (Publication No. 81-370-3105) or page 24-20 of the 1994 Town & Country, Caravan and Voyager Service Manual (Publication No. 81-370-4105).
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No. 24-05-16-90 0.4 Hrs.
FAILURE CODE: P8 - New Part