Buick Repair Questions? Ask a Mechanic for Answers ASAP
Bulletin No.: 06-04-114-001A
Date: May 08, 2006
with Versatrak(R) All-Wheel Drive (AWD) System
This bulletin is being revised to correct fluid quantities in the Parts Information. Please discard Corporate Bulletin Number 06-04-114-001 (Section 04 - Driveline/Axle).
Some customers may comment on a moan or groan type noise coming from the rear axle during parking lot or turning maneuvers. The "AWD Disable" light should not be illuminated with this condition. Verify that the noise is originating from the rear axle with the chassis ears and/or by using a long rubber hose installed on the rear axle vent and held up to your ear.
This condition may be caused by a slip-stick condition between the friction and reaction plates in the clutch pack unit. This may be the result of wear or excess moisture within the unit.
Perform the all-wheel drive (AWD) system function tests and the drain/refill/drive procedure listed below.
These maneuvers are the only way to activate the rear axle clutch packs and pump the new fluid throughout the system. The system design will not activate the clutches when driving in a straight line, only a wheel speed difference between the two rear wheels will activate the georotor pump and flush the clutch packs.
Please follow this diagnostic or repair process thoroughly and complete each step. There will be some vehicles where the damage to the clutch packs from wear or moisture will be too extensive to be fixed by this procedure. In these cases, rear axle assembly replacement will be necessary.