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 Grand Caravan Moan/Fog Horn Sound May Be Heard While Turning at Slow Speed
Dodge Grand Caravan Problem
Average Mileage: 85,382 mi (19,500 mi - 166,000 mi)
Visitor, 2002 Dodge Grand Caravan, 72,000 mi
Got the same problem. I saw somewhere that it may be just a filter in the power steering oil reseervoir. Looks like cleaning or replacing this filter would eliminate the noise.
Visitor, 2005 Dodge Grand Caravan, 19,500 mi
moan/fog horn sound not only while turning but while in park when van first start up. Have not fix problem trying to get the right answer.
Visitor, 2003 Dodge Grand Caravan, 70,413 mi
while pulling out from a parking space, during right turns. a monaing or grumpling sound can be herd.
Visitor, 2005 Dodge Grand Caravan, 99,000 mi