Noisy Power Steering

if you have the wheel on full lock then the bypass valves in the pump or steering box are activated to prevent steering and pump damage They will make a noise at this point
go to full lock then when the noise starts back off a bit and if it stops then that is the valves
if not take it to an accredited power steering shop for a diagnosis.

hi Eva.
As you turn your steering wheel it is this fluid pressure that aids in turning the wheels of your car. ... If the pump impeller is trying to move power steering fluid and starts catching air bubbles it can cause whining noises and vibrations to occur.
Maybe you've heard it at a stop light. Maybe you've heard it as you pass a car on the freeway. Or maybe you've heard it in the parking lot at work when someone is leaving. The unmistakable whine of a power steering pump can make even the most confident mechanic wonder when that car will breakdown.
Power steering pump noise is a unique noise that your car may make and once you've heard it you always know what it is. The noise is a mix of a whirring and a whining and will always vary with the speed of your engine whether your car is driving or in park. This whining noise can be subtle or extremely loud and may be worse in colder weather, or right when you first start your car.
Power steering pumps are most often vain style centrifugal pumps that are tasked with pressurizing the power steering fluid and pushing it down to your power steering gear or rack. As you turn your steering wheel it is this fluid pressure that aids in turning the wheels of your car.
There are a few reasons why you are hearing power steering pump noise from your car. First, it may simply be due to the design of the pump. Sometimes, noisy power steering pumps can continue to work flawlessly for years after they start making noise. This may simply be due to the manufacture's design or a tight tolerance in that particular pump. In this case, you would hear the noise but not see any other adverse effect like a loss in power steering, leaking fluid or a wobbly pulley. In this case, you may be able to help reduce your power steering pump noise by choosing a different type of power steering fluid, like a synthetic fluid.
Your power steering pump may also be making noises due to air trapped in the system. If the pump impeller is trying to move power steering fluid and starts catching air bubbles it can cause whining noises and vibrations to occur. Even tiny air bubbles you cannot see that are trapping in the power steering fluid may be causing the whining you are hearing. In this case, the best thing to do is flush your power steering system to try and remove the air from the system. Having air trapped in your power steering system can be difficult to diagnose so you may need to simply try a power steering flush to see if it solves your problem.
Power Steering pump noise may also be due to a failing power steering pump. As the bearings on the impeller go bad it will start to make noise as the pump is turning. If you have a bad power steering pump you usually will also experience leaks from around the pulley, a wobbly pulley, or difficulty turning the steering wheel when you are stopped. If you have multiple of these symptoms together, it is probably time to replace your power steering pump.
Lastly, and most usually, a whining power steering pump is an indication of a low fluid level. Your power steering fluid is probably something you have rarely if ever checked, so it often comes as a surprise if the level is low. Your power steering fluid reservoir is also relatively small so even a slow leak will cause a low fluid level relatively quickly. To confirm this is your problem it is as simple as checking your power steering fluid level. Some power steering reservoirs are clear so you can see through them to check how full they are. You may have to wipe away some dirt and grime to find the "full" line, but it should be easy to check. If you have an opaque power steering fluid reservoir there should be a small dipstick under the cap that will help you measure the fluid level. If it is low, then you have a leak somewhere and topping off the fluid should quite down your power steering pump.
If you discover a power steering leak, rather than simply continuing to add fluid every time it gets low, you should fix the problem permanently so you don't have to continue to check your power steering fluid level. Replacing lines or seals can be a surprisingly difficult task due to the location of your power steering pump and steering gear or rack. The easiest way to seal your leak is to do it from the inside out!

or check this link out for more info on this matter.
Power steering whining sqreeching Google Search

FIRST OF ALL TURN OFF RADIO REMOVE NEGATIVE BATTERY CABLE. THEN REMOVE POWER STEERING PUMP FLUID FROM POWER STEERING PUMP.USING A HAND PUMP SIPHON. BE CAREFUL DONT GET POWER STEERING FLUID ON CAR PAINT IT WILL DAMAGE PAINT JOB.PUT A DRAIN PAN UNDERNEATH CAR TO CATCH POWER STEERING FLUID THEN DISCONNECT POWER STEERING PUMP LINES.REMOVE POWER STEERING PUMP ADJUSTER BOLT AND MOUNTING BOLT.REMOVE POWER STEERING PUMP.MOST OF THE TIME NEW POWER STEERING PUMP DONT HAVE DRIVE PULLEY ON IT SO TAKE TO A MACHINE SHOP THE WILL REMOVE PULLEY FROM OLD PUMP AND PRESS ON THE PULLEY TO NEW POWER STEERING PUMP.BESURE TO BUY NEW O RINGS TO END OF PRESSURE LINE.ONCE NEW POWER STEERING PUMP HAS PULLEY IN PLACE AND YOU HAVE NEW O RING FOR HIGH PRESSURE LINE.INSTALL NEW PUMP.ADJUST BELT TENSION.NOW BLEED POWER STEERING PUMP WITH FRONT WHEELS POINT STRAIGHT A HEAD POSITION.POUR POWER STEERING FLUID IN PUMP UNTIL FLUID LEVEL ON COLD MARK ON POWER STEERING PUMP DIP STICK.KEEP ADDING FLUID UNTIL FLUID STOP DROPPING. START THE ENGINE LET IT RUN AT IDLE ADD MORE FLUID IF DROPS KEEP FLUID ON FULL COLD MARK.ON DIP STICK TURN OFF ENGINE.CHECK TO MAKE SURE POWER STEERING PUMP NOT LEAKING AT THE LINES THEN.SAFELY RAISE SUPPORT FRONT OF THE VECHICLE WITH JACK STANDS. MAKE SURE VECHICLE ON SOLID LEVEL GROUND CHECK.FLUID LEVEL MAKE SURE AT FULL COLD MARK. NOW START ENGINE.LET IDLE MINUTE.THEN TURN STEERING WHEEL ALL THE WAY TO THE LEFT TO RIGHT SEVERAL TIMES WITH OUT STOPPING IT IN PLACE. CHECK POWER STEERING FLUID WHEN FLUID LEVEL STOP DROPPING.AND FLUID IS NOT A TAN COLOR WHICH MEAN LOTS OF AIR IN SYSTEM. TURN OFF CAR UNTIL AIR BUBBLES DISAPPEAR.CHECK FLUID LEVEL BLEED POWER STEERING AGAIN. DONT DRIVE VECHICLE UNTIL STEERING FEEL NORMAL.IF FLUID REMAIN TAN WITH AIR BUBBLES CHECK FOR LEAKS AT POWER STEERING PUMP PRESSURE HOSE ORING. AND CHECK POWER STEERING LINES TO PUMP FOR LEAKS.

-- from the 1990-1999 Lumina / Silhouette / TranSport Repair manual ---

1992 Pontiac TransPort Power Steering Pump REMOVAL AND INSTALLATION

1. Disconnect the negative battery cable.
2. Disconnect and cap the power steering pump hoses.
3. Remove the accessory drive belt.
4. Remove the power steering pump pulley using a suitable puller tool.
5. Remove the pump mounting bolts and remove the pump from the vehicle.

See Figures 1, 2 and 3

Fig. Fig. 1: On some vehicles, you must use a puller to remove the power steering pump pulley

Fig. Fig. 2: Power steering pump mounting-early model vehicle shown

Fig. Fig. 3: Power steering pump mounting-late model vehicle shown

1. Installation is the reverse of the removal procedure. Tighten the pump mounting bolts to 18 ft. lbs. (25 Nm).
2. Bleed the power steering system to remove trapped air. Air in the system could cause noise and or damage to the pump.

BLEEDING

This procedure requires the help of an assistant.

1. With the engine OFF, the wheels off the ground and turned all the way to the left, fill the fluid reservoir to the FULL COLD mark on the fluid level indicator.
2. With an assistant checking the fluid level and condition, bleed the system by turning the wheels from side to side without hitting the stops. You should repeat this at least 20 times, making sure to keep the fluid level at the FULL COLD mark.

Fluid with air in it has a light tan appearance. This air must be eliminated from the fluid before normal steering action can be obtained.
See Figure 4

Fig. Fig. 4: Power steering bleeding procedure

1. Start the engine, and while it is idling, recheck the fluid level and add as necessary to reach the FULL COLD mark.
2. Return the wheels to the center position. Lower the front wheels to the ground and continue running the engine for 2 or 3 minutes.
3. Road test the vehicle to make sure the steering functions properly and is free of noises.

See Figure 5


Fig. Fig. 5: Torque specificatio

CHANGING POWER STEERING PUMP YOU HAVE TO PLACE A DRAIN PAN UNDER THE VECHICLE. SIPHON OUT POWER STEERING FLUID WITH A SIPHONER DONT USE YOUR MOUTH TO SIPHON SWALLOWING POWER STEERING FLUID CAN BE FATAL MAKE YOU SICK.WHEN ALL POWER STEERING FLUID IS REMOVED FROM POWER STEERING PUMP.REMOVE DRIVE BELT.THEN REMOVE THE POWER STEERING PUMP.THEN YOU HAVE TO REMOVE THE POWER STEERING PUMP PULLEY THE NEW POWER STEERING PUMP DONT HAVE A PULLEY YOU HAVE TO HAVE REMOVE PULLEY FROM THE OLD POWER STEERING PUMP.YOU NEED A PUMP PULLEY REMOVER AND A PULLEY INSTALLER.YOU CAN TAKE OLD POWER STEERING PUMP AND NEW POWER STEERING PUMP TO A MACHINE SHOP.THEY WILL REMOVE PULLEY OFF OLD PUMP PRESS IT ON NEW POWER STEERING PUMP.THAT WOULD BE CHEAPER THAN BUYING THE PULLER AND INSTALLER.GO TO AUTO PARTS STORE BUY NEW HIGH PRESSURE LINE O RING GOES TO PRESSURE LINE GOING INTO POWER STEERING PUMP.ONCE YOU GET NEW PUMP READY PULLEY BEEN PRESSED ON.TAKE POWER STEERING PUMP HOME PUT IT ON. BLEED POWER STEERING SYSTEM.WHAT YOU DO WHEN YOU GET NEW PUMP INSTALLED HIGH PRESSURE LINE IN PLACE.PUMP BOLTED IN DRIVE BELT ON POUR POWER STEERING FLUID IN POWER STEERING PUMP UNTIL FLUID LEVEL STOP DROPPING AND YOUR LEVEL ON POWER STEERING DIP STICK AT COLD LEVEL.NOW START CAR UP LET IT IDLE FOR 3 MINUTES.THEN TURN OFF ENGINE CHECK POWER STEERING FLUID IF FLUID LEVEL DROP ADD LITTLE MORE UNTIL LEVEL ON DIP STICK ON COLD MARK DONT OVER FILL.NOW SAFELY RAISE SUPPORT FRONT OF VECHICLE. START THE ENGINE.TURN STEERING WHEEL FROM ALL THE WAY FROM LEFT TO RIGHT DONT STOP LOCK WHEEL .GO LEFT TO RIGHT SEVERAL TIMES.THEN TURN OFF ENGINE CHECK FLUID LEVEL.IF ALL IS GOOD LET VECHICLE BACK DOWN LET IT SIT FOR A WHILE CHECK FLUID AGAIN.DONT DRIVE VECHICLE IF POWER STEERING PUMP MAKE NOISES OR YOUR STEERING FEEL STIFF HARD TO TURN.JUST MAKE SURE FLUID LEVEL RIGHT AND DRIVE BELT TIGHT GOOD LUCK.

Try to bleed all air from the power steering system:raise the front of the vehicle off the ground just until the tires are off the ground,start the engine,make sure the fluid is at the proper level,while engine is idleing turn the steering wheel from lock to lock in both directions( do not hold at full lock for more than a second) repeatedly,at a average turning speed back and forth about 10 to 15 times,shut engine off, lower vehicle,check fluid level once again,take out for test drive for at least 10 to 15 minutes,if noise is still present then it's time to replace the power steering pump.Good luck!

it is the power steering pump, very common problem

all the 3.6 liter engine,outlook, aura, vue anything with a 3.6 liter engine has noisy steering,there is no fix,,,just noisy

quite often ford steering pumps make noise, but if it is hard to steer, the fluid is probably low. First check underneath to see if there is a puddle, if there is then find and fix the leak. next, start it and get it to normal op. temp., while idling, pull the pump plug/ dipstick, check the level, add fluid if necessary. Steer the wheels back and forth a time or two, then check the level again. Double check underneath, visually inspect for puddles/wet spots. does the problem change after these steps? Theres not likely any water in it, therefore freezing isn't likely. Hope this helps.