Originally Posted by
danorules
OK, I would do a flush and fill before buying a new ps pump. spend the extra $ and buy the synthetic oil and see if the whine goes away. Its a lot cheaper fix than a new pump. If that isn't the fix, then replace.
Also, the friction modifier goes in the differential oil not the power steering oil.that's probably why it got worse
I have read several posts recommending adding a bit of friction modifier to the PS pump to quiet the sound.
I believe this pump is beyond fixing it with a flush. It sounds like a late 80s Ford. The fluid in it is nice and pink. I don't really want to throw a $30 fluid change at a $60 pump for it not to fix the issue, then have to buy the pump and flush again, putting that new fluid in the waste pan.