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if its not throwing a trouble code i think you best bet would be to look for a bad connection or drain on the system with a voltmeter. you can purchase a service manual such as a chilton or haynes and it will have all the trouble shooting steps outlined you need to track the issue down.
Would have to experience window problem myself, but sounds like you may need a new power window motor and/or window sash "peanut". (must remove door to fix this problem) 45 min. job for exp. tech. Good luck,best regards.
Does the drivers window still go up? You can hear it try even when its already up. If so, replace your switch. Then keep the rain from getting on the new one. This is a problem for alot of cars. Water and electrical connections=no good
Regarding the repair of the rear window defroster. There is a "electric ACD module" on the inside rear driver side roof sail that connects to the rear defroster and antenna. I had the same problem and found the connector for the defroster had overheated and melted resulting in a failed connection. The NAPA part numbers for the module and replacement connector are 25623688 and 15305949.
You may have gotten water and/or ice down into the controls in the door. Replacing expensive (several hundred dollars) modules might solve the problem. When the weather wams up it might go away on its own. I avoid opening my windows in the winter now that I know my Park Avenue is susceptible to the problem.