WHISTLE NOISE FROM BLOWER MODIFY BLOWER CASE

SUBJECT: WHISTLE NOISE FROM BLOWER - MODIFY BLOWER CASE

MODELS AFFECTED: 1990 SKYLARK

THIS BULLETIN IS BEING REVISED TO INCLUDE ARTWORK FOR FIGURE 1.

Some 1990 Skylark 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 BREAKPOINT

WITH AC WITHOUT AC FROM VIN # TO VIN # FROM VIN # TO VIN # ------------------- -------------------

LM050035 - LM060946 LM050070 - LM060946

In order to reduce the whistle noise, the following procedure should be used:

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

WARRANTY INFORMATION:

With A/C Without A/C Labor Operation Number: D1322 D1320 Labor Time: 0.4 hour 0.4 hour Trouble Code: 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.