Check the power steering pump for insufficient pressure.

Replace the power steering pump.

Check the hydraulic system. Test the power steering system pressure with a gage.

Replace the seals and the hoses, as needed.

Check for a sluggish steering gear valve.

Clean the pinion valve assembly. Replace the pinion valve assembly, as needed.

Check the power steering pump flow control valve for sticking and improper operation.

Replace the power steering pump.

Check the power steering pump serpentine belt for slippage.

Tighten the power steering serpentine belt.

Check for air contamination in the power steering system.

Bleed the power steering system.