WHISTLE NOISE FROM BLOWER - MODIFY BLOWER CASE

Models Affected: 1990 GRAND AM AND SUNBIRD MODELS

Some 1990 Grand Am and Sunbird models 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

VEHICLE BREAK POINTS

Sunbird

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

Sunbird L7585550 - L7601686

Grand Am

With AC Without AC Nameplate From VIN # to VIN From VIN # to VIN

Grand Am LC317136 - LC346000 LC320480 - LC346000

In order to reduce the whistle noise the following procedure should be used. The procedure for Grand Am is different than for Sunbird and is listed below for each carline.

Grand Am

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. Install previously removed motor and fan assembly

Sunbird

1. Same as above

2. Same as above

3. Same as above

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:

Grand Am

With A/C Without A/C

Labor Operation Number: D1322 D1320 Labor Time 0.4 hour 0.4 hour Trouble Code 92 92

Sunbird

With A/C Without A/C

Labor Operation Number: D1322 D1320 Labor Time 0.4 hour 0.4 hour Trouble Codes 92 92

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.