Re: 05 power steering/hydro noise
When I added the hydraboost to my K20, I had to fill the reservoir with it running until the pump quieted down. It would foam the fluid and cavitate the pump really bad until I tried adding fluid with it running. After topping it off a couple times running it finally bled out and had been great since. If you don’t have a fluid level/air issue I would suspect the pump is on the way out.
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