THE DIAGNOSTIC CHART, ON THE REVERSE SIDE OF THIS BULLETIN, REPLACES THE CHART C-4B ON PAGES 6E2-C4-5, AND 6E2-C4-7 OF THE 1986 BUICK CHASSIS SERVICE MANUAL. PLEASE MAKE THIS CHANGE IN YOUR COPY OF THE SERVICE MANUAL. NOTE: SEE PRINTED COPY OF BULLETIN FOR THE CHART
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.