WINDSHIELD WIPER CHATTER (REVISED BLADE & INSERTS)

SUBJECT: WINDSHIELD WIPER BLADE CHATTER (REVISED BLADE AND INSERT)

VEHICLES AFFECTED: 1988-91 "J" CAR

IMPORTANT: ---------- Before replacing any part, clean windshield and both blades with GM windshield cleaner, P/N 1050011 or equivalent. The glass is clean when rinse water does not "bead-up" across entire glass surface. Multiple cleaning may be required to remove all contaminants. Also, clean the wiper blades by using a cloth that has been saturated with full strength washer solution and wiping vigorously. Rinse the blades with clean water after cleaning.

Condition:

------------ Some 1988-1991 "J" cars built prior to the VIN Breakpoints listed below may exhibit windshield wiper chatter or reduced wipeability at road speeds. A revised graphite impregnated wiper blade insert was used in production to improve wiper performance.

VIN BREAKPOINTS

Chevrolet MJ180300 M7566731 Pontiac M7153762

Correction:

------------- Install revised insert. Carefully inspect blade assembly for bent or damaged conditions. Install revised wiper blade assembly if any damage is found.

P/N 22121047 - Insert Wiper Blade P/N 5049926 - Blade, Assembly With Insert

Use the most applicable Labour Operation and Time from the Canadian Labour Time Guide.

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.