2,474 posts, read 2,112,362 times Originally Posted by larrytxeast Well additional information is helpful..First to get a window A/C that will last 15-20 years and longer you'd have to go back at least 30 years. No time machines available at this time. If rain is bad enough water can migrate forward up the motor shaft and wash out the bearings. That's if a special washer is missing from the rear shaft of the motor. This could cause it to start screeching. It could seize up or attempt to tighten up. It may need oil. Fan cap could be bad. More likely worn bearings as the shaft being pulled to one side will cause the magnetic hum. Slide the unit out and see if it has oil ports. Aluminum or plastic plug on top both ends of the motor. Unplug unit first of course. OP, maybe this site will help you... My A/C unit won't turn on. 350 posts, read 428,894 times Do It Yourself , How To Change Capacitor On Air Conditioning Unit - YouTube 227 posts, read 285,883 times