TEMP. GAUGE READS TOO HIGH LIGHT COMES ON REPLACE SENDER

TRUCK REVISION: 03/17/94

THIS BULLETIN IS BEING REVISED TO ADD MODEL YEARS, MODELS, AND PARTS INFORMATION. PREVIOUS DIVISIONAL PUBLICATION NUMBERS WERE:

GMC TRUCK 91-8C-68 GM CANADA 91-8-500 ----------------------------------------------------------------------

SUBJECT: INDICATED OVERHEAT: TEMPERATURE GAUGE READS HIGH AND CHECK GAUGES LIGHT MAY COME ON (REPLACE TEMPERATURE SENDER)

MODELS: 1990-94 6H, 7H, P6, AND B7 MODELS WITH DIESEL ENGINES

CONDITION:

SOME OWNERS MAY EXPERIENCE AN INDICATED OVERHEAT CONDITION WHERE THE TEMPERATURE GAGE READS 20 TO 30 DEGREES FAHRENHEIT TOO HIGH. IN ADDITION, TRUCKS WITH RPO X54 OPTION (CHECK GAGES WARNING LIGHT ON THE DASH) MAY HAVE THE CHECK GAGES WARNING LIGHT ON DUE TO INCORRECT TEMPERATURE GAGE READING.

CORRECTION:

TO CORRECT THIS CONDITION THE TEMPERATURE SENDER SHOULD BE REPLACED.

TEMPERATURE SENDER REPLACEMENT (FIGURE 1)

REMOVE THE OLD SENDER AND REPLACE IT WITH THE PART LISTED BELOW. THE SENDER WILL BE LOCATED ON THE INBOARD SIDE OF THE RADIATOR INLET HOSE. THERE ARE TWO SIMILAR SENDERS AT THAT POINT, AND THE TEMPERATURE SENDER IS THE ONE ON TOP. THE NEW SENDER WILL HAVE SEALER ALREADY ON THE THREADS, SO NO ADDITIONAL PROCEDURES ARE NECESSARY.

SERVICE PARTS INFORMATION: QUANTITY PART NUMBER DESCRIPTION REQUIRED ----------- ----------------------- -------- 15684629 TEMPERATURE SENDER 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION DESCRIPTION LABOR TIME

N2230 REPLACE ENGINE COOLANT USE PUBLISHED TEMP. SWITCH OR SENDING UNIT LABOR OPERATION TIME

FIGURES: 1 USE ART FROM ORIGINAL CORP. BULLETIN #168301 CAPTIONS: FIGURE 1 - LOCATION OF TEMP. SENDER ON ENGINE

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 GMC TRUCK DIVISION, GENERAL MOTORS CORPORATION ALL RIGHTS RESERVED