Originally Posted by Jay11

There's no churning, it is just quiet in the reservoir.
A poked around with a stethoscope and the only place I could hear he distinct sound was after touching the back of the p/s pump. Is it possible for the unit to go bad while in the reservoir the fluid acts normal, w/o whirlpool effect? On the other hand I am new to MB, a diy weekend wrencher and I just acquired a steth. So I am getting familiar with it. How do I check spinning units such as pulleys, etc?

The whining sound is more noticeable after a cold start, eases some after the car warms up, it doesn't go away oh no, it's there and noticeable. It only changes slightly when u turn the steering wheel, but it's still noticeable present. What else can I do to establish the source?



I haven't removed the s/belt. Is this a sure way of establishing the source is psp? I can do this on Sunday.

I also noticed a ticking sound every so often that then goes away from the little unit circled below. Is this normal and what is this unit, what's it for?