Windshield Wiper Blade Chatter - Technical Service Bulletin
Wiper Blade: Customer Interest
Windshield Wiper - Blade Chatter
NUMBER:
88-T-159
CORP.REF.NO: 078308
DATE:
February 1991
SECTION:
8E
SUBJECT:
WINDSHIELD WIPER BLADE CHATTER/WIPEABILITY CONCERNS CAUSED BY CHANGE IN BLADE ANGLE
(INSTALL SPACER)
MODELS/YEARS:
1982-88 FIRENZA COUPE
Some 1982-88 Firenza coupes may experience driver side blade chatter and wipeability concerns.
IMPORTANT:
Before doing any work, clean windshield and both blades with GM windshield cleaner, PN 1050011 or equivalent. Then,
recheck wiper-washer operation. If problems persist after cleaning, follow the procedures in this bulletin.
CAUSE:
Some vehicles have a wiper housing mounting tolerance condition that changes the attack angle of the driver side blade assembly and can cause blade
chatter and wipe problems.
Figure 1
CORRECTION:
Install spacer, Package # 22111290, over driver side linkage housing. See Figure 1. Make sure spacer is correctly oriented. Parts are currently available
at GMSPO.
Install new screws provided finger tight, then torque evenly to 8 N-m (70 lbs.in.).
NOTE:
When reassembling cowl, make sure that washer hose is reconnected (and not pinched).
If an interference condition results between the wiper arm head casting and the cowl clearance hole, use a file to enlarge hole at interference point.
WARRANTY INFORMATION: