GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
GMC_Truck
🢒
1999
🢒
Envoy - 4WD
🢒
Steering
🢒
Power Steering System
🢒 Whine Noise in Steering Pump
Problem
Action
The pump shaft bearing is scored.
Replace the housing and the shaft.
Flush the system. Refer to
Power Steering System Flushing
.