Recently developed an issue where I will lose power steering after about 30 mins of driving. The steering is heavy and gets very stiff on the highway at speed. RPM does not seem to make a difference. I see fluid moving in the bottle and no strange noises. I believe it could be the pump going but has anyone every heard of a steering box binding up randomly? Trying to get some ideas before I point the parts cannon at it.

 

What steering fluid are you using? How long since you flushed the system?

 

I haven’t flushed it so not sure on either question.

 

Well maybe start there. Replace with Pentosin CHF 11S. It's expensive, but it can make a huge difference.

 

Some more testing of this issue, not sure I am
loosing power steering but it more feels like something binding up. This seems to only
occur at highway speeds and mostly turning right. Once I get off the highway it’s binds up a little more then is fine on back roads at or under 40mph.