The power steering pump pulley is loose.

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

The pump vanes are sticking in the rotor slots.

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

The pressure hose is touching other parts of the vehicle.

Adjust the hose position. Refer to Power Brake Booster Inlet Hose Replacement or Power Brake Booster Outlet Hose Replacement .