DTKWOK,
I have the same sounds, so I made sure I turned off the fans, AC and all other stuff, but the Ody doesn't purr quietly like it did when I first got it. It does sound a lot like a tractor, and I've only got 1500 miles on it. I will try to bring it in next week and see what kind of answer I get!
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Susan
'01 SS EX, cargo tray
'96 Grand Cherokee
'89 Accord LXi
'89 Kawasaki ZX600R