Problem Description and Possible Solution
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.
Average mileage: 93,130 (19,500–166,000)
15 people reported this problem
Moaning, vibrating noise heard/felt when turning the steering wheel at slow speeds.
Replaced steering pump reservoir, which seemed to help, somewhat.
I fixed the problem by simply adding power steering fluid to the reservoir approximately 3/8" over the max fill line. The noise is gone completely. Try this before replacing anything.