I just changed the power steering fluid in the wife’s ‘00 Explorer, after following the owners manual and using Mercon V ATF fluid. Surprisingly easy to change the fluid, but now the steering has a slight shudder when turning. I’m assuming some air is in the system, as it is a bit better after driving around the block a few times. Am I on the right track here, as I don’t want to my wife pissed that I ruined a previously working power steering system. The old fluid was pretty dark, however.