The filter screen is in the resivoir. Replacement of the resivoir is needed to replce it. Here is the tsb from chrysler on the whine noise. The screen becomes plugged with dirt and causes the lack of fluid to the pump from the resivoir. Make sure you use ATF +4 when you refill the system. Do not use power steering fluid.
DATE: Jan. 11, 2002
2001 (RS) Town & Country/Caravan/Voyager2001 (RG) Chrysler Voyager (International Markets)
A power steering moaning/groaning sound may be heard under most operating conditions.
The sound is typically worse at cold start up and during lower speeds and parking maneuvers.
If the vehicle operator describes the above symptom/condition, refer to the 2001 RS Service Manual or the MDS2, Section 19, Steering, Diagnosis and Testing - Steering System Diagnosis Chart, for possible causes. If no causes are found, perform the Repair Procedure.
1. Wipe the power steering cap and area free of dirt. Remove the power steering cap.
4. Locate the power steering cooler attached to the crossmember support plate. Slide back the clamp and disconnect one of the two power steering return hoses at the power steering oil cooler and drain fluid in an appropriate container.