A/C - Whine/Hum/Moan/Vibration at Idle or Slow Speeds: Overview

File In Section: 06 - Engine/Propulsion System

Bulletin No.: 99-06-03-005A

Date: December, 2000

TECHNICAL

Subject:
Generator Noise
(Whine/Hum/Moan/Vibration) in Passenger Compartment at
Idle, Slow Speeds, Decelerating or Parking Maneuvers (Replace Heater Inlet & Outlet Pipe Adapter Bolts and/or Heater Inlet & Outlet Pipe Adapter Assemblies and Heater Inlet Hose Assembly)

Models:
1999 Buick Riviera
1999-2001 Buick Park Avenue and Ultra
(Built Prior to VIN Breakpoint 14171337)
2000-2001 Buick LeSabre
(Built Prior to VIN Breakpoint 1U149421 - Hamtramck Plant)
2000-2001 Buick LeSabre
(Built Prior to VIN Breakpoint 14171337 - Orion Plant)
2000-2001 Pontiac Bonneville
(Built Prior to VIN Breakpoint 14171337)

This bulletin is being revised to update model and parts information, repair procedures and labor times. Please discard Corporate Bulletin Number 99-O6-03-005 (Section 06 - Engine/Propulsion System).

This bulletin is being issued to provide additional information regarding the generator noise condition described below. The heater inlet and outlet pipe adapter bolts were implemented into production in March, 1999 in order to reduce the generator noise condition. However, as part of our continuing effort to further reduce the generator noise condition and to ensure a high level of customer satisfaction, new heater inlet and outlet pipe adapters are now available from GMSPO.

In addition, for the 1999 Park Avenue/Ultra ONLY, a new heater inlet hose assembly is also available from GMSPO.

Condition

Some customers may comment about a magnetic whine/noise/hum/moan/vibration that can be heard inside the passenger compartment. This condition may be more pronounced at idle, slow speeds, decelerating and during parking lot maneuvers.

Cause

This condition may be caused by the normal magnetic pulses from the generator being transmitted into the passenger compartment by way of the heater inlet and outlet fasteners, adapters and hoses that are attached to the bracket shared by the generator mounting.





Heater Inlet/Outlet Pipe Adapters





Parts Information

Parts are currently available from GMSPO.

Warranty Information





For vehicles repaired under warranty use the table.