I fixed this problem when it came up several years ago. The filter in the reservoir eventually gets clogged, so I replaced the reservoir, and the whine was gone. If you drain your reservoir (Turkey baster works well) shine a light into it and see if your filter is clogged. If not, then try this fix. Use Amsoil "Signature Series Multi-Vehicle Synthetic ATF". This eliminated a whine that started when the weather got a little colder. Fill reservoir back up with the Amsoil, and that should do the trick.I've' been hearing Noise and feeling roughness when parking in my wife's '03 Caravan 120,000 miles. No leaks and fluid is full. Notice noise is louder after 30 minutes of driving. It Sounds like low fluid Groan. Although I see no Pump or Rack leaks should I be thinking of a New Rack Assy. ? Any additives help this ? Seafoam ? Thanks and Happy Holidays !
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