There is air in the power steering fluid.

1. Inspect the power steering system for leaks. Refer to Power Steering Gear and Pump Leaks .
2. Bleed the power steering system. Refer to Power Steering System Bleeding .

The fluid level is OK , but still foams.

1. Remove the power steering pump.
2. Inspect the soft plug for cracks.
3. Inspect the housing for cracks. Refer to Power Steering Pump Disassembled View .
4. Replace the power steering pump. Refer to Power Steering Pump Replacement .

The power steering pump is leaking internally.

Inspect the power steering pump for leakage.

Refer to Power Steering Gear and Pump Leaks .

Replace the power steering pump. Refer to Power Steering Pump Replacement .