For 1990-2009 cars

# DUAL BED CATALYTIC CONVERTER UPDATE CHANGE PROCEDURE

#### VEHICLES AFFECTED: 1981-84 Vehicles Equipped With Dual Bed Converters

Comments have been received expressing concerns about the health effects of dust produced when servicing the catalyst in vehicles equipped with Dual Bed Converters. (Campaign Numbers: 4R13, 4R18, 4R19, 4R20) (Bulletin Numbers: 84-6-235, 84-6-253)

Several studies have been undertaken to review this matter. The studies showed that catalytic converters can be serviced safely because very little, if any, dust is produced if the procedural steps are followed when replacing the catalyst. These studies also showed levels of lead and other metals were well under the safe limits. Therefore, it is recommended that prior to bead removal, personnel review the appropriate service and/or campaign bulletin, allow the catalytic converter to cool, add water to the outlet end of the converter, and put on a suitable dust mask, rubber gloves and safety glasses. Specifically important is the step requiring the addition of 16 oz. of water to the outlet end of the converter prior to bead removal.

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.