NOISE/VIB. DURING COOLING FAN OPER. (REPL. FAN AND MOTOR)

Subject: NOISE/VIBRATION DURING COOLING FAN OPERATION (REPLACE COOLING FAN AND MOTOR ASSEMBLY)

Models Affected: 1989-91 SUNBIRD MODELS W/2.8L AND 3.1L

Application: 1991 Sunbird with 3.1L (VIN T)

Condition: Cooling fan noise (rumble/booming) is heard in passenger compartment. Vibration is felt within car through the seats, floor pan and steering wheel.

Cause: "Harmonic" vibration between the cooling fan assembly and vehicle structure.

Correction: Replace the cooling fan and motor assembly. Replace parts according to the part numbers listed in the "Part Information" below.

IMPORTANT: Both parts MUST be replaced.

Service Procedure:

Refer to Section 6B for Cooling Fan and Motor replacement.

Note: The threads attaching the fan to the motor are LEFT handed threads.

Parts Information:

P/N 22088773 - Motor Assembly, Cooling Fan

P/N 22098789 - Blade Assembly, 6 Blades, Cooling Fan

Parts are currently available from GMSPO.

Labor Operation Number: J3400 Use applicable labor time.

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.