Alternator Whine after Bulletin 99-06-03-005 - kw 99-06-03-005A accessory adapter bracket bolt coolant electrical fluid generator heater hose low moan noise speed vibration

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

99-06-03-005 was revised to specify the use of double o-ring heater hose adapters in the DFA bracket. The purpose of the 2nd o-ring was to hold the adapter concentrically in the DFA bracket so that it did not ground out. There have been some instances in which the customer is tuned into this noise to the point where they were not satisfied with the results after the bulletin was completed.

1. Verify the double o-ring adapters are not binding. The retaining bolts which help secure the adapters in place have a torque spec of 89 inch pounds. If the bolts are over-tightened this condition may be aggravated.
2. When properly installed the adapters will "FLOAT" in the DFA bracket and can be slightly wiggled back and fourth.
3. The noise may also be emanating through the fuel pressure regulator. Temporarily disconnect the vacuum line and evaluate for a change. It may be a good idea to apply vacuum to the fuel pressure regulator while the line is disconnect so as to avoid an "over rich" condition.
4. If after BULLETIN 99-06-03-005 has been completed, and the above 3 steps do not make any further improvements and the sound is still objectionable, continue to the next step.
5. Obtain locally a molded radiator hose with a 2 inch i.d. that is at least 14 inches long.
6. Cut a 14 inch length off of the purchased hose. Then cut through the 14 inch piece along its length (SLICE IT LENGTHWISE) so that it can be slipped over the two heater hoses.
7. Slip the hose over both heater hoses and zip tie it into place using plastic zip ties. Pull the zip ties so that there is a noticeable amount of tension being exerted on the hose.
8. Evaluate the vehicle for improvement.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

(2000-03 Buick LeSabre) and (2000-03 Pontiac Bonneville) and (1999-03 Buick Park Avenue)

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