A/C COMPRESSOR SLUGGING OR RATTLING ON START-UP

SUBJECT: AIR CONDITIONING COMPRESSOR "SLUGGING" OR RATTLING ON START-UP (REPLACE ACCUMULATOR)

MODELS: 1993 CHEVROLET AND GMC G VANS WITH HR6 AIR COMPRESSOR

CONDITION:

SOME OWNERS MAY COMMENT ON AN AUDIBLE "SLUGGING" OR RATTLING NOISE COMING FROM THE COMPRESSOR WHEN THE VEHICLE IS STARTED AND THE AIR CONDITIONING SYSTEM IS ON.

CAUSE:

REFRIGERANT FROM THE ACCUMULATOR MAY PROPAGATE TO THE AIR COMPRESSOR WHERE IT CAN CONDENSE TO A LIQUID STATE. WITH THE ENGINE OFF, THE REFRIGERANT COLLECTS INSIDE THE COMPRESSOR CAVITY. WHEN THE ENGINE IS STARTED AND THE AIR CONDITIONER IS ON, THE LIQUID REFRIGERANT PASSES THROUGH THE COMPRESSOR CAUSING THE SLUGGING OR RATTLING SOUND. THE SOUND WILL GO AWAY ONCE THE REFRIGERANT HAS PASSED THROUGH THE COMPRESSOR.

CORRECTION:

A NEW ACCUMULATOR WITH A PRESSURE EQUALIZATION HOLE MUST BE INSTALLED. THIS NEW ACCUMULATOR WILL MINIMIZE REFRIGERANT TRANSFER TO THE COMPRESSOR.

SERVICE PARTS INFORMATION

P/N DESCRIPTION QTY

2724885 ACCUMULATOR ASM. 1

PARTS ARE EXPECTED TO BE AVAILABLE FROM GMSPO ON 11/15/93.

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME D3280 ACCUMULATOR ASSEMBLY USE PUBLISHED REPLACE LABOR OPERATION TIME

FIGURES: 1

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 1993 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.