The weird thing is, though, that if I shut off the car and start it back up (even just 5 minutes later), everything goes back to normal for a while.

But once I am driving for say 10 - 15 minutes or longer, it starts making noise on turns and gets heavy.

I recently changed the pump to another used pump. This is the 3rd pump I have replaced in the last 2 weeks, could this be another bad pump (even though it doesn't leak fluid, as far as I have seen, and it doesn't have air bubbles in the reservoir)?

What are other things that could be causing this? I was reading up other causes of the general whining noise and some were suggesting replacing the pump inlet fitting O-ring, but I am not sure if that is the case here.

Is there any easy test I can do to see if it really is the pump inlet fitting O-ring in my case or if there is something else going on?

  • Is there any reason it couldn't be the rack itself? Jun 10 '15 at 1:36
  • You mean the rack and pinion? I just changed that, so theoretically, it shouldn't be that. Jun 10 '15 at 3:30
  • How did you go about bleeding the pump after isntallation? Jun 10 '15 at 11:25
  • Did you ever get this resolved? Jul 26 '15 at 10:59

This sounds like air in the system. It is the most common cause of this symptom. Leaks in the pump to reservoir hose or pump inlet o-ring fitting are common. Even if you do not see bubbles.

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