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Hi,
At first thought, I would suspect that you need to change the fluid out.
The fluid’s additives may have depleted or broken down and it’s now foaming on its own.
Go to a different brand that highlights its anti foaming characteristics.
Maybe even a chemical sealing concoction is needed. They can help temporarily, how ever long that is?
There are a couple ways to exchange the fluid, neatly, by a suction gun or using the pumps return line into a container.
Some people, I believe Art Benstein has a picture, get the belt loose to one side and use an electric drill to drive a socket on the nut of the pulley.
Usually air entrainment, if that’s the case here, comes in from the suction side of any pump. A return line or a shaft seal on the suction side having a loose clamp, split or wear.
Shaft seals can leak in air at first during motion but then get worse to lose fluid. These types of vane pumps don’t create a lot of suction, in a general sense.
I’m not an automotive mechanic to have much experience in seeing these type of occurrences that I’m throwing out here. That’s why I like the depleted fluid idea, first!
Past that, you need to make sure that there is no air trapped in the rack when exchanging fluids.
Get the front end up on jacks so you can easily turn the wheels back and forth to their extremes easily and quickly several times. It would seem to me that driving the car this long that it’s not the problem.
Have you ever had to add extra fluid recently?
It’s possible that you have a leak at the ends of the rack and then fluid is being captured within the rubber boots.
There is a steel tubing line running between the boots to allow air that is captured inside them to shift back and forth freely as the bellows collapse and expand.
If that passage becomes filled with fluid I can see the “possibility” that air might get pushed back through the large rod seals that leak anyway.
It’s sound almost impossible, to me really, but having some partially filled up bellows might get the job done?
Loosen the large end clamps or wire ties and drain them if you are losing fluid!
You could Check for excessive fluid by leaving them as is. At least give them some quick squeezes with that touchy-feely moment under the car and looking for tears or should I say splits.
There’s no crying in doing car work, is there? (:-)
Phil
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