K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Weatherstrip: All Technical Service Bulletins
Doors (Front) - Wind Noise
BULLETIN NUMBER:
92-10A1-137
SECTION:
10A1
NUMBER:
2
CORPORATE
REFERENCE NUMBER:
261506
DATE:
October 1992
SUBJECT:
FRONT DOOR WIND NOISE (DIAGNOSE/INSTALL REDESIGNED PARTS AS INDICATED)
MODELS:
1988-92 C/K TRUCKS
Owners of some 1988-92 C/K Vehicles, may comment on unacceptable front door wind noise, Multiple root causes may contribute to the customer's
perception of front door wind noise, such as:
-
Improper front door alignment.
-
Gaps between the window and the door.
-
Inadequate sealing between the door and the cab.
-
Inadequate sealing within the mirror area.
Changes are currently being made to repair front door wind noise. The following bulletin is divided into the following two sections.
I.
Wind noise diagnosis and testing.
II.
Repair of the below locations:
A.
Door alignment.
B.
Door glass sealing.
C.
A-pillar sealing.
SERVICE PROCEDURE
The first step of the repair process in correcting wind noise is to identify the main cause(s). A determination must be made as to whether the cause of the
noise is air escaping from the vehicle or outside air turbulence.
I.
WIND NOISE DIAGNOSIS
Suggested below are a number of diagnostic techniques that could be used to help isolate the main cause(s) of the wind noise condition.
CUSTOMER WRITE UP:
Answers to the following questions should be obtained from the customer:
1.
What specific noise is objectionable?
A.
Whistle
B.
Flutter
C.
Rush of air
