WHISTLE NOISE FROM BLOWER - MODIFY BLOWER CASE

Subject: WHISTLE NOISE FROM BLOWER

Model and Year: 1990 CAVALIER, BERETTA AND CORSICA

TO: ALL CHEVROLET DEALERS

Some 1990 J, and L vehicles built between the VIN breakpoints listed below may exhibit a "whistle" noise when the blower is operated under certain conditions. The whistle noise may be experienced under the following operating conditions:

With A/C Without A/C - High Blower Speed Only - High Blower Speed Only - Max AC Mode - Bi-level Mode - Norm AC Mode - Vent Mode - Bi-level Mode - Temp Lever Set to Full - Vent Mode Cold Position - Temp Lever Set to Full Cold Position

VEHICLES BREAKPOINTS J Car

All With or Without AC Plant From VIN # to VIN #

Janesville LJ223934 - LJ249597 Janesville LJ223934 - LJ255087 Lordstown L7159861 - L7168602 Lordstown L7160654 - L7168602

VEHICLES BREAKPOINTS L Car

All With or Without AC Plant From VIN to VIN #

Linden LE193605 - LE202697 Wilmington LY199448 - LY213672

In order to reduce the whistle noise the following procedure should be used. The procedure for N is different than for J & L and is listed below for each carline.

J & L Car

1. Remove blower motor and fan assembly from vehicle. 2. Locate tab (Figure 1) inside blower motor case. 3. Bend tab downward about 20 degrees as shown in Figure 1. 4. Replace blower motor assembly using kit part number 22098839 with some modifications as listed: - Do not use spacer provided in kit. - Do not use long screws provided in kit. - Do not use extended blower motor cooling tube. 5. Using the fan nut provided in the kit, install original fan on new motor assembly. 6. Install blower motor/fan assembly on vehicle.

WARRANTY INFORMATION:

J CAR With A/C Without A/C Labor Operation Number: D1322 D1320 Trouble Codes: 92 92

L CAR With A/C Without A/C Labor Operation Number: D1322 D1320 Trouble Codes: 92 92

Refer to the correct model year labor time guide for labor hours.

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.