A/C Compressor - Rattling on Startup With System On
Group Ref.: HVACBulletin No.: 431213
Date: April, 1994
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.