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so i noticed that my radio (stock) is making a whining/whistling sound through the speakers....
it is louder when the cd player is playing.... not the am/fm...
cant tell if it goes away when you turn up the volume, or you just cant hear it anymore..
but when the volume is low the whistling sound is loud1!! almost sounds like a fuel pump. and when you hit next track you can hear crackling?? almost like the you can hear the cd player making adjustments to get to the next track through the speakers.
Is the CD playing from a changer rather than the deck itself? If so, it could be somewhere along the run of the wiring harness the insulation has rubbed off and you're picking up interference.