A/C COMPRESSOR CUT OFF DURING EXTEN. ENG. IDLE AT HIGH TEMP.. Buick Skylark 1994

REVISED: 07/27/94

THIS BULLETIN IS BEING REVISED TO INCLUDE ALL ENGINE APPLICATIONS FOR THE "N" SERIES. ENGINE APPLICATION FOR THE "L" SERIES IS STILL THE 3.1L ENGINE ONLY BUT NOW ALSO INCLUDES THE Z26 PACKAGE. ALSO, A "NOTE" STATEMENT REGARDING INTERFERENCE FIT HAS BEEN ADDED TO THE CORRECTION PROCEDURE. PLEASE DISCARD BULLETIN 431217 (GROUP REFERENCE 1 - HVAC).

REVISION: 09/23/94

THIS BULLETIN IS BEING REVISED TO INCLUDE THE 1995 MODEL YEAR. PLEASE DISCARD BULLETIN 431217A (GROUP REFERENCE 1 - HVAC). ______________________________________________________________________

SUBJECT: A/C COMPRESSOR CUT OFF DURING EXTENDED ENGINE IDLE AT HIGH AMBIENT TEMPERATURES (REPLACE ENGINE COOLING FAN)

MODELS: 1994-95 CHEVROLET BERETTA AND CORSICA WITH 3.1L ENGINE (VIN M - RPO L82) OR Z26 PACKAGE

1994-95 BUICK SKYLARK 1994-95 OLDSMOBILE ACHIEVA 1994-95 PONTIAC GRAND AM

CONDITION:

SOME OWNERS MAY EXPRESS CONCERN WITH THE A/C COMPRESSOR CUTTING OUT DURING EXTENDED ENGINE IDLE OR IN "STOP AND GO" TYPE TRAFFIC.

CAUSE:

THE A/C COMPRESSOR SHUTS OFF DUE TO HIGH A/C SYSTEM PRESSURES AND/OR HIGH ENGINE COOLANT TEMPERATURES.

CORRECTION:

NOTE: PERFORMING THE FOLLOWING CORRECTION PROCEDURE MAY CREATE AN INTERFERENCE FIT BETWEEN THE COOLANT FAN AND THE RADIATOR. SHIMS MAY BE PLACED BETWEEN THE COOLANT FAN BRACKET AND THE UPPER RADIATOR SUPPORT. A MINIMUM OF 10MM DISTANCE IS REQUIRED BETWEEN THE RADIATOR AND THE COOLANT FAN.

REPLACE THE CURRENT ENGINE COOLING FAN WITH NEW LOW PROFILE 240-WATT ENGINE COOLING FAN, P/N 22137323. ALONG WITH THE NEW ENGINE COOLING FAN, A NEW FAN CONTROL RELAY ASSEMBLY, P/N 12088577, MUST ALSO BE REPLACED.

FOLLOW SERVICE PROCEDURES OUTLINED IN SECTION 6B FOR THE ENGINE COOLING FAN AND SECTION 8A FOR THE COOLING FAN RELAY IN THE APPROPRIATE SERVICE MANUAL.

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION NUMBER: J3400 LABOR TIME: .8 HR ADD: .1 HR (TO REPLACE FAN CONTROL RELAY)

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.