SQUEAK NOISE FROM COWL AREA INTERFERENCE WITH HOOD

VEHICLES AFFECTED: 1985-86 S/T TRUCKS

On some 1985-86 S/T trucks, a squeaking noise may be heard from the cowl panel area. This noise may be caused by an interference condition between the hood rear flange and cowl vent panel (Figure 1). The rear hood flange length should not exceed 25.0 mm at any point. If this distance is exceeded, a squeak may result which could sound as if it is coming from the instrument panel. Before repair efforts are made in the instrument panel area, it is advised that the cowl vent panel be inspected first. If the cowl panel is confirmed to be the source of the noise, follow the service procedure listed in this bulletin.

Service Procedure

Remove the hood assembly adn place on a protected surface face down. Care should be used so that paint damage does not occur.

Grind the rear flange of the hood at its interference points. The hood flange length should not exceed 25.0 mm at any point.

Paint as required.

Remove the cowl vent panel and paint as required.

Reinstall cowl vent panel and hood assembly.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.