A moaning or fog horn sound may be heard while turning at a slow speed. Installing a finned power steering cooler will help alleviate the problem, but it may be necessary to replace the power steering rack.Google+
Car Problem Reports
Dodge Caravan Moan/Fog Horn Sound May Be Heard While Turning at Slow Speed
Dodge Caravan Problem
Average Mileage: 123,720 mi (74,500 mi - 148,000 mi)
Visitor, 2002 Dodge Caravan, 124,100 mi
Low speed and parking MOAN from Power Steering Pump. Drained ATF+4 fluid and removed and cleaned Power Steering RESIVOR...Screen at bottom gets clogged and restricts flow to pump at low engine RPM, Replaced fluid-USE ATF+4 fluid and bleed by cycling the steering lock to lock a few times,check fluid level,noise GONE!
This problem I have never replaced the rack, but extended the inlet line to the cooler to about 18", the correct specification for this repair can be obtained through Chrysler. The vibration causing the noise is still there but dampened by the extra length of power steering line, a rack is only a temporary cure.
Loud noise when the car came to a complete stop after it was on cruise control. Tolk me it was the power steering pump, which cost $856, but is now making a noise when I turn the wheel. May have to replace the rack and pinion.
Power steering pump fog horn sound when cold