2009 Smart For Two makes a farting noise when idling

My Smart Passion has been making a "farting" noise when it idles.  This has been going on for months.  The dealer can not figure it out.  It seems to be happening when the AC is on.  Hoping someone else has had this problem and fixed it.  Any ideas out there?  The dealer has tightened the suspension, changed the brakes and the rotors.  Nothing has helped yet.  

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Comment by Quinn on August 2, 2013 at 4:48pm

Sorry to hear about your flatulent smart. Please call us at 800-367-6372 and let's see if we can figure out what's disagreeing with your smart. Alternatively, you can direct message me your contact information and I can have someone reach out to you directly.

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