Air in fluid.

Inspect and bleed the system.

Refer to Foaming, Milky-Appearing Power Steering Fluid .

Fluid is low due to improper initial fill or system leak.

Inspect and bleed system.

Refer to Checking and Adding Power Steering Fluid .

The pump mounting is loose.

Torque the pump mounting to proper specifications.

Refer to Power Steering Pump Replacement .

The power steering gear inlet (pressure) hose is grounding out.

Check and adjust for proper mounting and clearance.

Refer to Power Steering Hoses Replacement .