I have a 1994 Trep 3.3L.. My rear defrost/heated mirrors work intermitantly. i know its not the fuse. There is a buzzing sound behind the tach area that's present when they do work. no sound when they don't. Is that a relay and if so how can I get at it to change it? I took out the intrument panel but the sound is behind that. I have no probs with the heat/ac system. The light always goes on when I push the rear defrost button but the defroster doesn't work. My daughter has an 2001 Sebring and when I turn on her rear defroster you can hear a click coming from the same area behind the left side of the instr. panel so I'm assuming it's a relay and that mine is just going. Thanks.