Be sure to turn on the heater to have the coolant run through it and remove air pockets. Once warm you will want to ensure you have removed any remaining air pockets.
I have read that some people park their cars on an incline, nose up to allow the remaining air to work its way out.
If you can, replace the powersteering pump filter since the link has been broken and you are replacing the fluid. Do use PS fluid BTW.
Also as a side maintenance item, lube your throttle linkage now while it is easy to get to. MBZ recommends ATF fluid on the ball joints.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)