MOAN/WHINE/VIB. NOISE WITH TCC APPLIED

MODELS AFFECTED: 1989 CENTURY WITH 3300 ENGINE (VIN CODE N) AND 125C TRANSAXLE

Owners of 1989 Centurys built before VINs:

Framingham ..............KG405797 Oklahoma City ........... K6404808 Tarrytown................KT461581

equipped with a 3300 engine and 3 speed automatic transmission may comment of a moan/whine/vibration type noise during and after transmission Torque Converter Clutch (TCC) apply.

This condition may be repaired by rerouting the (existing) transmission cooler hoses per the following procedure. The attached illustration shows the proper rerouting.

Procedure

IMPORTANT: None of the metal lines/fittings should have to be disconnected from the coolers or transmission to perfom this procedure. Also, no new hoses will be required.

1. Place vehicle on hoist.

2. Remove the rubber hose and clamp from the auxiliary cooler lower fitting. Install it on the auxiliary cooler upper fitting after removing the existing upper hose and clamp. Install the removed upper hose and clamp onto the lower auxiliary cooler fitting.

3. Remove the rubber hose and clamp from the lower cooler line at the transmission. Install it on the upper cooler line at the transmission after removing the existing upper hose and clamp. Install the removed upper hose and clamp onto the lower cooler line at the transmission.

4. Remove the rubber hose and clamp from the lower cooler line at the radiator. Install it on the upper cooler line at the radiator after removing the existing upper hose and clamp. Install the removed upper hose and clamp onto the lower cooler line at the radiator.

5. Ensure that all hoses and clamps are installed secure, and not in contact with any other vehicle component (i.e. hose clamp contacting A/C accumulator). Hoses must not be kinked, twisted or crossed.

6. Lower vehicle, and check the transmission fluid level per Service Manual Section 7A. Also, check for any fluid leaks.

WARRANTY INFORMATION

Labor Operation Number: T1416 Labor Time: .5 Hours Trouble Code: 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.