is there a way to cycle through power steering fluid?
for example on my astro van and other cars i would disconnect the reservoir and just stick the inlet tube into new fluid and it will just suck it through and cycle everything in like 2 minutes.
is there such a way on this car? since the box is attached to pump

 

I have seen where people disconnect the line coming from the cooler line that goes back the the reservoir and collect the old fluid coming from it. They keep filling the reservoir as the level goes down.

I used the basic method of sucking out the old fluid from the reservoir and fill with new fluid. I went thru a 1 liter tin and it cleared up alot, seemed to be running very quiet afterwards also. I didnt want to risk breaking a hose or getting air in the line.

In my W204 the reservoir is mounted right to the pump, so theres no line to disconnect and use. Think you are stuck filling thru the reservoir.

 

Here is a good write-up on it: https://mbworld.org/forums/e-class-w...ing-flush.html

 

Disconnect the return line and move the steering wheel lock to lock, it will eject fluid [into a bucket]. Keep filling as you go with new fluid until the fluid ejected is new.