Re: power steering pump whines at first start up of the...
This is common with many cars due to the hydraulic fluid being cold and causing the pump to moan/whine for a short time as it's working harder to move the fluid as it's thicker until it gets a little heat into it; this will be more pronounced on a very cold or freezing day. Any noise when the pump has warmed up is another issue entirely.
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Power steering pumps whine when they are low on fluid, or if they are goin bad. Serpentine belts also whine in cold weather or when they are goin bad. Tru spraying just a little WD40 on the belts when its running, if it goes away, you should be thinking about a new belt. If nothing changes, check the power steering fluid, if its full, take to a mechanic
power steering pumps can be noisey for years without actually failing but in saying that, the longer you let the pump whine the more metal will be going into your rack causeing premature rack replacing. if the level is ok and it whines then the pumps on its way out
You shouldn't need to replace 2 pumps,or even one. It shouldn't whine,where you hear it, driving.
I would change the steering rack,flush the cooler and pump. Still got a whine ,your getting bad rebuilt pumps
normally, the only part of your automatic transmission that will make a whining noise is the pump. it usually whines when iether the fluid is low or more commonly when the transmission oil filter is getting plugged up.
the power steering pump will also make a whining noise too.
turn the wheel all the way to the right and hold steady pressure against the stop. this puts maximum force on the power steering pump and, if the power steering pump is the one making the whine, it will change the sound of it. (usually louder).
if the trans pump is making the whine noise, it should sound different in neutral compared to drive. this test will really only work if it make the noise without the vehicle moving. if it wont do it at idle hold the rpms at 2000 or so.
if you decide the noise is coming from the transmission, and the transmission filter has not been replaced (assuming you installed a used transmission), replace the filter by removing the oil pan.
oh and also, if it is the power steering pump you should be able to make it make the whining noise while the vehicle is stationary. if it wont make noise unless its moving its not the power steering pump.
The oil pressure is normal. A whining sound could come from anywhere on the vehicle from the power steering, alternator, auto transmission, the water pump or even the air conditioner. It could be the power steering pump. Check this by moving the steering wheel back and forth. This will put load on the system and it will increase the whining if it is the problem.
A power steering pump will whine if it is low on fluid, when you turn the wheels you will hear the whine or if the power steering belt is to tight you will also hear the whine. You will not hear this whine when the truck is stopped.