A/T - Whistle Noise From Right Cowl Area
Number: 93-176-10Section: 10
Date: APRIL 1993
Corporate Bulletin No.: 361203
ASE No.: B1
Subject:
WHISTLE NOISE FROM RIGHT COWL VENT AREA
Model and Year:
1992-93 S/T TRUCKS WITH AIR CONDITIONING
CONDITION:
Some owners of 1992 and 1993 S/T Trucks equipped with air conditioning may experience a whistling noise from the right cowl vent area when the air conditioning controls are in the BI-LEVEL mode or when switching from the MAX to NORMAL modes.
CAUSE:
The whistle noise is caused by air being forced past the vent seal.
CORRECTION:
To correct this condition a revised vent door actuator with a stronger spring applying additional force to the vent door has been released. The revised actuator was released in production beginning with the following VINS:
MORAINE 1GNDT13WXP2140318
PONTIAC WEST 1GCCS14A4P0131510
SHREVEPORT 1GCCS14R6P8143456
SERVICE PROCEDURE:
Follow "Plenum Side Vent Actuator Replacement" procedure outlined in section 1B of the 1993 S/T Service Manual.
SERVICE PARTS INFORMATION:
PART NO. DESCRIPTION QTY
1996833 Actuator, Inside Air Valve 1
Parts are expected to be available on 4/12/93.
WARRANTY INFORMATION:
For vehicles repaired under warranty use:
LABOR OP. DESCRIPTION
D1790 Actuator, Vacuum Diaphragm, Replace
Use applicable labor time guide for labor hours.