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Re: 2003 Lincoln LS V8 3.9 whining noise from behind back seat
I know it's kind of late, but I just found this. My guess would be the subwoofers. The factory 6x9 subwoofers are located in the rear deck and the electrical current from the air conditioning system could be interfering. It may be a bad ground or something, but my car used to do this every now and then.
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