Wiper Blades - Chattering and Poor Wipeability
90chevy34GMC NUMBER: 91-8D-39
GROUP: 8D Windshield Wiper/Washer System
DATE: December, 1990
CORPORATE
NUMBER: 031066
SUBJECT: CHATTERING WIPER BLADES OR BLADE WIPEABILITY
MODELS: 1991 AND PRIOR YEARS, LIGHT AND MEDIUM DUTY TRUCKS
CONDITION:
Chattering and poor wipeability comments may be due to the windshield glass and/or wiper blades becoming contaminated by insect residue, dirt, road grime, carwax etc.
CORRECTION:
1. Clean the windshield glass with GM # 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.