Why does Power steering noise(severe) occur when engine gets hot?

Causes of Power Steering to fail.

• Contamination problems occur more frequently in rack and pinion power steering systems. Contamination can occur when pumps fail, hoses deteriorate, or moisture gets into the power steering fluid. All of these problems result in material contaminating the power steering fluid which can plug small orifices in the steering system, increase friction, and interfere with the fluids hydraulic characteristics, resulting in a failure of the power steering system.

Low fluid

• Low power steering fluid levels reduce the amount of hydraulic pressure created by the power steering pump, resulting in hard steering. Low fluid levels also cause increased wear of the power steering pump from inadequate lubrication and high fluid temperatures which further accelerates pump wear. Low power steering fluid can cause a power steering pump to wear out prematurely and can result in the eventual failure of the power steering system if not corrected.

Snapped belt

• Many vehicles use power steering pumps which are driven by a belt connected to the crankshaft of the engine. Worn belts can slip causing a reduction in the fluid pressure produced by the power steering pump, which increases the effort needed to operate the steering system. Power steering belts that catastrophically cause an immediate loss of power steering as the pump is no longer being driven by the engine.

Worn pump

• As power steering pumps are operated and age they wear out. The seals and internal parts of the power steering pump break down over time and lead to an incremental loss of fluid pressure. As the pump wears out, pump noise and steering effort increases. Worn out pumps will eventually fail, leading to a total loss of fluid pressure and a failure of the power steering system.

Leaks

• Power steering systems require hydraulic fluid to operate. Hydraulic power steering fluid can leak from worn or damaged hoses and failing seals. When enough fluid is lost, the power steering pump can overheat or wear out prematurely, resulting in a loss of hydraulic pressure and failure of the power steering system.

If the hose itself is leaking (not the connection/end) , replace the hose. If the hose is more than 5 years old, I'd probably just replace it. If it's the low pressure hose (return) and it's leaking at the junction, you can probably replace the clamp. If it's the high pressure hose (with the machine-formed hose ends) then replace the hose - a clamp is unlikely to withstand the pressure and you don't want to take the chance of it blowing off when you're turning.

See my prior answer about using hose to listen to locate exact point of noise. This works better than you can imagine.

It could be a leaking hose, and the PS fluid is dropping on the hot exhaust. Check the fluid level in the power steering reservoir. If low or dry, look for a leak.
I don't know about the rattling-better have someone look at it.

Hi:

Check to see if you have a Power Steering hose leak ,Open Hood and Have someone inside turing Steering wheel back and Forth slow.While you have a Light and Locate your Leak.

Power Steering System is a Sealed System, Sounds like you have a Hole in 1-of your Power Steering Fluid Lines(Pressure) More that likely. or Return line.

If its leaking at the Pump where your hoses go in it might just be a Rubber Seal. But the most common problem is a Hose is Busted Open.

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the rack and pinion unit may have a pinhole leak

Sounds like your power steering fluid is low, you may have a power steering leak, look for fluid draining out of your vehicle, wet spots on the ground etc. The system can leak from the hoses between the pump and the steering rack, from the steering rack itself, from the pump itself. Check all of these items to determine which is leaking, you will have to fill the power steering fluid to find the leak. If this sounds like way too much, then take it to your favorite repair shop and have them take a look. Hope this helps, let me know.

Dealer, but did you check the Power steering fluid level??or any leaks. There are two hose that connect to the gear box from the power steering pump. if the pump is low on fluid you lose your power steering, if the hose has a leak or it blew and lost the power steering fluid then you lost your power steering again. 
Check the fluid level to the power steering pump and any leaks or broken hose to the gear box.
Keep me posted, be glad to help and good luck.

you have to bleed the power steering system. you have someone turn the wheels to the left while you watch the power steering fluid level adding as needed. than repeat turning the wheels to the right. and repeat until the noise seems to get quieter and you don't have to ad any more fluid.


hope this helped
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if its more of a whining its your power steering pump.