2005 Chrysler Grand Voyager Steering

where all parts changed at same time?

No the mechanic changed the pump which did not work then to the rack then reservoir then pipes and had the recommended fluid too and the car is awfull still

That is what I figured see this often. Suspect old pump bad sent debris throughout system Tech didnot flush system.
so then rack replaced debris in system so contamination takes out new pump and damages spool valve in rack. then lines as a last gasp attempt. so you still have problem job done incorrectly and now pump and rack need replaced and full system flush

The system was fully flushed prior to each new part being fitted and still as bad

Did you witness flush? was flush machine used? or filter installed in-line?

The system was machine flushed each time. More
Symtoms sound like air in the system at low speed when not turning the wheel

Replaced entir steering system and has problem not being there to phyisicaly see vehicle can only surmise something in repair went wrong. Air bleeds out easily by a few lock to lock turns. Has ball jionts-strut mount bearings been checked to not be binding?

I had the car jacked up last night lifted drivers side front up and the grinding stopped put it down and lifted passenger side up and the grinding came back appears the be a drivers side issue.

Remove dr side tierod turn by hand should move easily if not suspect ball joint