For 1990-2009 cars

# CHATTERING WIPER BLADES OR WIPEABILITY

#### SUBJECT: CHATTERING WIPER BLADES OR BLADE WIPEABILITY (CLEANING PROCEDURE)

#### MODELS AFFECTED: 1982-1991 DEVILLES, FLEETWOODS, ELDORADOS, SEVILLES 1982-1988 CIMARRONS 1987-1991 ALLANTES

Some 1982-1991 DeVilles, Fleetwoods, Eldorados, and Sevilles; 1982-1988 Cimarrons; and 1987-1991 Allantes may experience a condition of chattering and poor wipeability during windshield wiper operation.

This condition may be caused by the windshield glass and/or wiper blades becoming contaminated by insect residue, dirt, road grime, car wax, etc.

To repair this condition use the following procedure:

1. Clean the windshield glass with GM P/N 1050011 (Bon Ami) glass cleaner or equivalent.

#### IMPORTANT: The glass is clean when rinse water does not "bead up" but "sheets" across the entire glass surface. Multiple cleanings may be required to remove all contaminants.

2. Clean the wiper blades by using a cloth that has been saturated with full strength washer solution and wipe vigorously. Rinse the blades with water after cleaning.

In addition, refer to Section 8E of the Service Information Manual for additional diagnosis of wiper chatter conditions.

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.