Why does the power steering whine when it gets hot even after the dealer replaced the pump and rack and bled the system properly?

Answer 1

Do NOT pour any additives into your Power Steering. Car makers specifically warn against these additives--especially anything with teflon in it. It can clog filters and destroy your P.S. pump.

Chrysler vehicles must be bled with a vacuum pump to remove any air.

If it still whines, the filter may be plugged. Here's how to replace it:

http://www.ricksfreeautorepairadvice.com/make-model/Chrysler-make-model/minivans/load-moaning-sound-on-cold-start-Chrysler-vehicles

It is possible that it was not bled correctly. It may also be that because when the fluid gets hot it thins out, as with any type of oil. There are a lot of aftermarket products that claim to fix things such as this--I would recommend Lucas, or depending on the type of car, if it is not factory equipped with ATF for the power steering fluid, to switch it over to ATF, as tranny fluid is a better hydraulic fluid than power steering fluid, and will not harm any power steering components. In fact, most vehicles produced from 2002 on, use ATF as a factory-installed steering fluid.

I hate to tell you that the dealer draws from the same pool of techs that anyone else would. Not to mention the techs at a dealer are generally paid on the amount of work done. Sooooo... why do you assume that it was bled right?

I have a Nissan Altima '95. The engine of the car gives a very thin cranking noise when it is started. Auto repair guys told me that I need to replace the power steering pump. Can it be the reason for this?

( bled right ) is a great dealerships do not care , they are there to make money mean your money , you need to see if they ( the dealer) filled it with fluid. again they don't care about you or your property , ( money) is all.....

BLED RIGHT is the best i have seen, it doesnt matter how many times you change the pump if the reservoir where your fluid goes is dry or empty that is what is making th whine noise you hear nothing more nothin less. if you have no water in your washer its simply not going to wash right well same with the power sterring no fluid no turn, your trying to force a machine to do something it has no power sterring fluid to help it do. ITS SIMPLY DRY of FLUID!!..

There are many reasons to cause a whine even after bleeding. They include air in the system, plugged filter (though not all cars, particularly older cars, have a power steering fluid filter), and age. It is not uncommon that the pump itself may have problems with its working parts. My best suggestion is to replace the filter and use ATF fluid. Otherwise the easiest way to remove the whine is to replace the pump itself, which could be wearing out anyway. And no, it is not simply dry of fluid.