e39 Noise/ Steering issue

I have a 1999 528i. the last couple days an odd issue has arose. When I start the car after its been sitting for a few hours (4+) there is a noise
emitting from the driver side area of the engine compartment. If I turn the steering wheel in either direction the noise get abit louder. Its sort of a reeering noise. If you drive it aways (10mi or so) the noise goes away and doesn't return till the car has sat. I thought possibly the Power steering pump, but from what I can tell this car doesn't have one and it has a Rack/Pinion type setup instead, and I could be completely wrong on that also.
Anyone have ideas on this odd noise that has shown up?
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Thank you,

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Branden Nelsen
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Also...
I have not noticed any issues with Steering at all, that all seems to be fine, nice and tight.
-Branden

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I checked and it looks to be to the "Full" line on the stick. I will double check tonight.
Anyone else have some ideas? Thanks in advance!
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Thank you,

~~~
Branden Nelsen
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Even if it has rack and pinion steering, it has a power steering pump. Look some more.
HINT It will be driven by a fan belt on the front of the motor.

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I took a quick glance, (not removing any "covers") but there is alot hidden, I will double check.
Thanks again Branden

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Mark you were right, I went back and the reservoir was almost empty! Now I have to track down where this leak is. I filled it again to be safe and that seems to have fixed the bad sound.
Thanks for the help guys! Branden

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