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Re: A/C fan motor burnt; I replaced it, and it will not...
Manuals for these may be near impossible to find considering the age of the unit. I couldn't find anything on line. Your fan problem may lie with the thermostat control. Check the thermostat wiring at the unit end.
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Is it the motor or capacitor? If the capacitor is bad the motor won;t run, it will just hum or run real slow.
If it is the motor and it's the 3rd one then you need to go to a more heavy duty motor, for instance if it's a 1/4 horse power then go to a 1/3 hp. etc.
Shut off the power before inspecting or repairing! I would check the wiring harness inside the condensor unit for loose connections and or broken wire first. Then you might try removing the capacitor to the fan (some operate both the fan and compressor) and have it tested. If all is OK then your fan motor is probably overheating and may need replaced. A bad capacitor can cause the motor to overheat. If you had a lightning storm just before the problem the capacitor is most likely the problem.
I gather that it is the outdoor fan motor that runs a bit then stops.
Fan motors that stop by themselves are overheating and going into self-protect. The fact that you replaced the motor and capacitor opens up a whole world of "which wire is in the wrong place". I could do this if I could see it, but I can't see it. You're probably going to wind up calling a service man to sort out the wiring.