I know this is a month old but sorta ran into the same thing on my "new to me" 05 coupe. Only 1 channel is working on my Sony but have power coming out of all 4 at the plug, my ac fan did not work and when I pulled the cabin filter out it was soaked. The fan motor was fried. Looking deeper I found my drains were ALL clogged. New fan and resister and I am COOLED down and now I am looking for another amp to get me rocking on all channels soon. Could not of done it without the help of this forums. You guys ROCK!!