For 1990-2009 cars

# 'A'AND'X'CAR VIBRATION- INITIATED BY TIRE AND WHEEL

SOME 1982 "A" AND "X" CARS COULD EXPERIENCE AN OBJECTIONABLE RIDE VIBRATION THAT WHEEL BALANCE WILL NOT CORRECT. STEEL 13-INCH WHEELS, CODE "TZ," PART NUMBER 9590763, BUILT BY HYDRA-MATIC-WARREN FROM MAY 24 THROUGH JUNE 22, 1982 MAY HAVE EXCESSIVE RADIAL RUNOUT. THESE WHEELS CAN BE IDENTIFIED BY THE CODE STAMPED NEAR THE VALVE AS FOLLOWS: (SEE BULLETIN) IF A VIBRATION IS ENCOUNTERED ON AN "A" OR "X" CAR EQUIPPED WITH THESE WHEELS, ALL WHEELS WITH THESE CODES SHOULD BE REPLACED BEFORE WHEEL BALANCING IS ATTEMPTED. THE WHEEL REPLACEMENT PROCEDURE MUST INCLUDE MATCH MOUNTING THE TIRE'S HIGH POINT DOT TO THE NEW WHEEL'S VALVE (THE LOW POINT), WHEEL BALANCING, AND COLOUR COATING IF NECESSARY. IF THE TIRE'S HIGH POINT DOT CANNOT BE FOUND, MARK THE TIRE AT THE OLD WHEEL'S VALVE, AND ALIGN THE NEW WHEEL'S VALVE TO THIS MARK. VIBRATION CORRECTION ON CARS NOT EQUIPPED WITH "TZ" WHEELS SHOULD FOLLOW NORMAL DIAGNOSTIC PROCEDURES OF WHEEL BALANCING, MEASURING RUNOUTS, ETC., PER THE SERVICE MANUAL.

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.