Power Steering Pump - Noise
Bulletin 87-3-2ADate Apr. '87
Ref. No. 87-023A-3
Corp. Ref. No. 703201R
SUBJECT: POWER STEERING PUMP NOISE
MODELS AFFECTED: 1986 AND 1987 FRONT WHEEL DRIVE ELECTRAS AND LESABRES
When servicing the power steering system, pump noise can occur if the system is not properly bled. This is due to air becoming trapped in the system causing pump cavitation. To properly bleed the power steering system, it is important that prior to starting engine, the steering wheel be rotated from stop to stop until no air bubbles appear in the reservoir fluid. In some cases, it may take up to 20 cycles to completely remove the air; therefore, it is recommended that the front wheels be raised off the floor when turning steering wheel.
Power steering fluid should be checked "hot" and filled to the "hot" mark to obtain proper fill.
Except as noted above, the remainder of the bleed procedure on Page 3B3-2, in the 1987 Buick Chassis Service Manual, should be followed.