For 1990-2009 cars

# A/C COMPRESSOR RATTLING OR SLUGGING ON START-UP

#### SUBJECT: A/C COMPRESSOR RATTLING OR SLUGGING ON START-UP (REPLACE ACCUMULATOR)

#### MODELS: 1991-93 BUICK ROADMASTER 1993 CADILLAC FLEETWOOD BROUGHAM 1991-93 CHEVROLET CAPRICE 1991-92 OLDSMOBILE CUSTOM CRUISER

#### CONDITION:

CUSTOMERS MAY COMMENT ON AN AUDIBLE RATTLING NOISE COMING FROM THE COMPRESSOR WHEN THE VEHICLE IS STARTED AND THE A/C SYSTEM IS ON.

#### CAUSE:

WITH THE ENGINE OFF, THE LIQUID REFRIGERANT COLLECTS INSIDE THE COMPRESSOR CAVITY. WHEN THE ENGINE IS STARTED AND THE A/C IS ON, THE LIQUID REFRIGERANT PASSES THROUGH THE COMPRESSOR CAUSING THE RATTLING OR SLUGGING SOUND. THE SOUND WILL GO AWAY ONCE THE LIQUID REFRIGERANT HAS PASSED THROUGH THE COMPRESSOR.

#### CORRECTION:

A NEW ACCUMULATOR WITH A PRESSURE EQUALIZATION HOLE MUST BE INSTALLED. THIS NEW ACCUMULATOR WILL MINIMIZE THE AMOUNT OF LIQUID REFRIGERANT IN THE COMPRESSOR.

SERVICE PARTS INFORMATION:

CHEVROLET, CADILLAC AND OLDSMOBILE:

1991 VEHICLES USE P/N 2724897 1992-93 VEHICLES USE P/N 2724901

#### BUICK ONLY:

1991 BUICK WAGONS USE P/N 2724897 1992 BUICK WAGONS USE P/N 2724901 1992 BUICK SEDANS BUILT PRIOR TO VIN NR421429 USE P/N 2724897 1992 BUICK SEDANS BUILT AFTER VIN NR421429 USE P/N 2724901 1993 BUICK VEHICLES USE P/N 2724901

#### PART AVAILABILITY:

PARTS ARE EXPECTED TO BE AVAILABLE AT GMSPO ON 5/16/94.

#### WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE: LABOR OPERATION: D3280 USE PUBLISHED LABOR OPERATION TIME.

FIGURES: 0

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.

COPYRIGHT 1994 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.