Noise when taking a left bend

[lago911]

I own a 1991 Porsche 964 C4 Cabrio and have the following problem.... when I take a turn to the left (also at low speed) I hear a noise which appears to come from the engine compartment, its like a buzzing or groaning noise. When the car (engine) is cold the noise is much louder than when its warm... when the car has been used for a while the noise only appears at high speed corners.
Anybody has an idea where to look?
Thanks, Marco.

[kurquhart]

Power steering? Although that should groan on right turns, too...

[Chris Wiles]

Check the Wheel bearings. It has nothing to do with the car running hot or cold, but it sure sounds like a bearing is out on that side. Easy check.

CW

[advantagedent]

my 89 c4 has a problem too bubles the power streeing fluide still trying to fig it out

[Rick Lee]

Had the same thing after a shop had my engine out. They were a few cups low on ps fluid and that fixed it.

[JCaffarella]

Mine used to make a noise only when I'd make left turns. It sounded like the rear tire was rubbing the inside of the wheel well. I topped off the power steering fluid and haven't heard the noise since.