EXTREME ENGINE TEMPERATURE GAUGE FLUCTUATION

SUBJECT: EXTREME ENGINE TEMPERATURE GAUGE FLUCTUATION (INSTALL A NEW THERMOSTAT)

MODELS: 1996 CHEVROLET AND GMC C/K, G MODELS WITH 4.3L, 5.0L, 5.7L ENGINES (VINS M, R, X, W - RPOS L30, L31, LF6, L35)

CONDITION:

SOME OWNERS MAY EXPERIENCE EXTREME ENGINE TEMPERATURE GAUGE FLUCTUATION.

CAUSE:

THERMOSTAT WAS NOT OPTIMALLY POSITIONED TO SENSE TRUE ENGINE COOLANT TEMPERATURE.

CORRECTION:

INSTALL A NEW THERMOSTAT WHICH INCREASES COOLANT FLOW PAST THE THERMOSTAT TEMPERATURE SENSING ELEMENT.

PARTS INFORMATION REFER TO THE FOLLOWING PART NUMBER WHEN REPLACING THE THERMOSTAT:

DESCRIPTION: THERMOSTAT PART NUMBER: 12557859

PARTS ARE EXPECTED TO BE AVAILABLE ON APRIL 8, 1996 FROM GMSPO.

WARRANTY INFORMATION FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION: J3500 LABOR TIME: USE PUBLISHED LABOR OPERATION TIME.

FIGURES: 0 ATTACHMENTS: 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 1996. GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.