C 20 P/U 2WD V8-305 5.0L (1985)
Window Seal: Customer Interest
Side Door Glass Lower Seal - Wind Noise
Number:
87-164
Section:
10
Date:
June, 1987
Subject:
WIND WHISTLE AT SIDE DOOR GLASS LOWER SEAL
Model and Year:
1985-1986 C/K AND 1987 R/V MODELS
FIGURE NO. 1
Some 1985-1986 C/K and 1987 R/V models may experience a whistling sound at or near the front door glass beltline seal. This sound is due to the
window regulator mechanism moving the window away from the beltline seal while in the full up position. The whistling sound may be more pronounced
when the A/C control is in the "vent" mode and the blower fan is on medium or high speed. To repair this condition, a new inner beltline door seal, P/N
15569071 (L) and P/N 15569072 (R) has been released for service. This new seal is approximately 3/16 of an inch longer than the original seal.
Measurements showing the difference between the old and new seal are shown in Figure No. 1.
The new seal eliminates the need for performing the procedure described in Truck Service Bulletin 86-B-19, dated December, 1985.
The following VIN breakpoints identify when the new seal was incorporated into production.
St. Louis
Chevrolet HS154946
GMC
HS519882
Flint (Pickup)
Chevrolet HF390307
GMC
HF724416
Flint (Suburban/Blazer)
Chevrolet HF152540
