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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The first sign of fluid leaking from the power steering is a pump whine, because the fluid is low, the pump will start to make a whine noise, especially when turning the steering wheel.
If you think you may have a car power steering leak, the first thing you should do is check the power steering fluid reservoir, if the fluid level in the reservoir is low, you just might have a leak in the power steering system.
Power steering fluid has a very distinctive smell, it smells like a burnt marshmallow, that is my opinion on the smell, and I'm sure you will not find that documented anywhere on the internet or any repair manual.
If you feel the steering in your vehicle binding up, or the power steering pump starting to make whine noise, it's a good sign your power steering fluid level is getting low or it's empty.
Running the power steering pump with low or no fluid could be very damaging to the entire power steering system because metal particles from the pump enter the system and cause internal failure of the steering rack and to its valve body or to the steering gear box.
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.
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.
Sounds like a dry/failing bearing or power steering pump noise. You first need to try to track down where the noise is originating, and the most likely place is at the front of the engine.
I would start by listening with the hood up while parked with the engine running and the noise present, and seeing if it is coming from there. If so, the most likely cause is something connected to the belt - e.g. AC compressor clutch, tensioner, power steering pump, or generator. Can also be caused by the belt just slipping (warn out belt, tensioner not working properly).