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Whine usually occurs on tight turns maximising pump output and/or pump may be worn and needs replacement. Leakage can be from pump reservor,connection, or power rack and pinion steering assy. Spray off any area with a sign of fluid with a brake clean or carb. cleaner and look for signs of leakage.
The cap for the power steering fluid is located to the rear of the engine on the left side and quite a distance down from the top. It is not easy to get to and you need to be very careful not to burn yourself when accessing it since it is near the exhaust manifold. Best to top it off when the engine is cold.
I am guessing the steering rack is starting to go bad. That is quite expensive to fix. The whining noise is the rack sucking air due to the steering fluid has leaked out. You can check your power steering fluid level and add some with stop leak to see if that helps. The filler cap is at the rear of the engine on the passenger side and is quite hard to get to. Be sure to not reach down to remove the cap unless the engine is cool. There is a high risk of burning yourself on the exhaust manifold.
The power steering reservoir on 3800 V6-equipped vehicles is located behind and below the rear cylinder head.
With the engine off unscrew the resevior cap and remove the cap wipe the dip stick with a clean cloth(paper towel) and re-install. remove once more and check the level on the dipstick. and then reinstall turn till it stops