8/13/2023 0 Comments Gm service bulletins by vin*TTĬOMMENTS OF A CLUNK OR A THUMP NOICE FROM REAR OF VEHICLE WHEN BRAKES ARE APPLIED.ĬOMPLAINTS ABOUT A SQUEAL NOISE COMING FROM THE BRAKES. *TTĬUSTOMERS MAY COMPLAIN OF COOLANT LEAKS, LOW COOLANT LIGHT 'ON', OVERHEATING, NO HEAT, NO START, OR ODORS EMITTED FROM THE AIR CONDITIONING SYSTEM DUE TO THE COOLANT RECOVERY TANK PRESSURE CAP NOT FUNCTIONING PROPERLY. SOME CUSTOMERS MAY COMMENT ON A WHIRLING SOUND FROM THE LOWER REAR SIDE OF THE ENGINE, OCCURING AS THE ENGINE WARMS UP, BETWEEN 15 ENGINE RPM ON VEHICLES WITHIN VARIOUS VIN BREAKPOINTS. *TTĪ CONDITION WITH DRIVELINE VIBRATION / GROWL NOISE. *TTĪ CONDITION WITH A MISMACHINED ENGINE CRANKSHAFT - INSPECT ENGINE / REPLACE IF REQUIRED. INFORMATION REGARDING MISMACHINED ENGINE CRANKSHAFT ON TRUCKS EQUIPPED WITH 4.3L V6 ENGINES. SOME VEHICLES WITH 4.8L ENGINE (VIN V - RPO LR4) AND 4L60-E AUTOMATIC TRANSMISSION (RPO M30) MAY EXHIBIT A DOUBLE BUMP OR HARSH SHIFT WHEN MAKING A WIDE OPEN THROTTLE (WOT) 1-2 UPSHIFT. ![]() SOME OWNERS MAY COMMENT ABOUT FRONT SUSPENSION COIL SPRING NOISE. THIS NOISE MAY BE MORE NOTICEABLE WHEN THE WINDOW IS IN THE DOWN POSITION. SOME OWNERS MAY COMMENT ON A RATTLE NOISE WHEN CLOSING EITHER OF THE FRONT DOORS. ![]() SOME CUSTOMERS MAY COMMENT ON A HIGHER THAN EXPECTED ACCELERATOR PEDAL EFFORT FROM THE IDLE POSITION, C/K SERIES PICK UPS (SILVERADO AND SIERRA). SOME CUSTOMERS MAY COMMENT ABOUT THE SERVICE ENGINE SOON LAMP BEING ILLUMINATED WITH NO OTHER DRIVEABILITY CONCERNS NOTICED ON VEHICLES BUILT PRIOR TO THE VIN BREAKPOINTS MENTIONED IN THIS BULLETIN. ON A STEERING WHEEL OR FRONTEND VIBRATION. ![]() Close General Motors Technical Service Bulletins
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