My power steering pump us very loud. Pro Blend by Keyser has quieted it some. I have used almost 3 bottles of it. Maybe I should drain the whole system and put only Pro Blend in. I have read and seen videos where a new pump still whines And I have seen that the Saginaw pump is the best option for quiet and longevity. Why do these whine and why do the new stock pumps whine? They must not have whined out of the dealership when new. Could a fluid flush solve it?

 

My stock one wines as well. It had a lot of air in it from the previous owner. I just ignore it

 

Air. It's pretty tough to get it out. There's a Ford recommended procedure to bleed them, but I don't remember it off-hand.

 

NOTE: A whine heard from the power steering pump can be caused by air in the system. The power steering purge procedure must be carried out prior to any component repair for which power steering noise complaints are accompanied by evidence of aerated fluid.
Remove the power steering pump reservoir cap. Check the fluid.
​​​​​​Raise the front wheels off the floor.
Tightly insert the stopper of the vacuum pump into the reservoir.
Start the engine.
Install the vacuum pump and maintain maximum vacuum, 68 - 85 kPa (20 - 25 in-Hg).CAUTION: Do not hold the steering wheel against the stops for more than 3 to 5 seconds at a time. Damage to the power steering pump can occur.
Cycle the steering wheel fully from stop to stop 10 times.
Stop the engine.
Release the vacuum and remove the vacuum pump.
CAUTION: Do not overfill the reservoir.Fill the reservoir.Use approved transmission fluid.
Start the engine.
Reinstall the vacuum pump. Apply and maintain maximum vacuum, 68 - 85 kPa (20 - 25 Hg).CAUTION: Do not hold the steering wheel against the stops for more than 3 to 5 seconds at a time. Damage to the power steering pump can occur.
Cycle the steering wheel fully from stop to stop 10 times.
Stop the engine, release the vacuum, and remove the vacuum pump.
CAUTION: Do not overfill the reservoir.Fill the reservoir as needed and install the reservoir cap.
Visually inspect the power steering system for leaks.
Lower the vehicle.
CAUTION: Do not overfill the reservoir.Fill the reservoir as needed and visually inspect the power steering system for leaks.
Install the reservoir cap.


This is the procedure I used, you'll need a vacuum pump like a mityvac and an adapter that seals to the power steering reservoir lid. Should all be at your local parts chore.

You can also do the same procedure without vacuum, but it's likely you won't get all the air out.

 

Hi. Thanks. I am a little unclear on the procedure. Which Mityvac? One that hooks to a compressor? So you are draining the fluid with the vac while doing the procedure with the wheel. Twice. And refillimg after each time right?