Power Steering in my 2000 windstar

Hi, , Recently, the power ateering has started to groan while turning the steering wheel. I would expect this to happen if it was hard over, but
this happens when it is turning, with light pressure. It sounds like air in the system, but the reservoir is full, and at the proper limits. Is there another problem?? Thanx
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.