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Power Steering problems

terrible power steering noise on start up and on turns

Subaru Outback 2007 120k

I had a power steering noise that did not want to go away

I checked the rack boots they are good, Next I did a fluid flush and used "seafoam" turning became smoother, noise the same.

Next I tightened the belts, noise improved.

Next I changed the O-ring on the return hose no noise on start up or turns unless I have to lock the steering wheel

not sure what I should do next change to eliminate the squealing completely

should I change the hoses or is it a pump problem, or maybe rack?

Thank you

replace the pump

Replaced the pump (got OEM part from the junk yard for $20). problem solved. Thanks for great advice :)