Had the same problem with my 1997 Explorer. The day before it happened, I had moved the car without starting it (pushed it to a different parking spot). It started having the same problem as yours just after that. Turns out by cranking the steering wheel without power, it introduced air into the power steering fluid (per my mechanic). Didn't make much sense to me how that could happen, but he drained/bled/flushed the line and refilled. Haven't had the problem since. Hope this helps.
Friday, March 28th, 2014 AT 9:36 AM