GM Service Manual Online
For 1990-2009 cars only

Possible Cause

Correction

The pump pulley nut is loose

Tighten the nut.

The vanes stick in the rotor slots.

Free the vanes by removing the following foreign material:

    • Burrs
    • Varnish
    • Dirt

The pressure hose touches other parts of the vehicle

Adjust the position of the hose.