A/C Fan not blowing, just humming


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Old 07-16-16, 05:29 AM
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A/C Fan not blowing, just humming

My inside A/C fan is not blowing, it just hums. The outside A/C fan seems to work just fine.

I replaced the inside A/C fan capacitor with brand new capacitor (same voltage and uf)... turned it back on, and it still just hums. I let it sit for about 1/2 hour to see if the fan would eventually kick on.... and it did kick on. It kicked on for only a few minutes, the air was cool, but didn't come out of registers very strongly...seemed to be blowing maybe 1/3rd to 1/2 as hard as it normally does. Then is just turned off and started humming again.

Haven't been able to get it started up since then.

Any ideas of where to trouble shoot from here would be greatly appreciated! Thank you in advance!
 
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Old 07-16-16, 06:04 AM
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Don't run the A/C if the inside blower isn't working, as the system will freeze up. That's likely what happened after you replaced the capacitor and you noticed that the airflow was reduced. It was likely reduced because the evaporator coil was frozen. Have you tried turning the blower motor by hand? Does it turn easily? If it turns hard, the bearings may be bad on either the motor or the squirrel cage (unless it's a direct drive motor, in which case there are no squirrel cage bearings/bushings). If the motor doesn't startup right away, it's not good to leave it turned on humming. That is just heating up the motor windings.
 
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Old 07-16-16, 08:43 AM
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yes, the motor turns easily. Have any other ideas for trouble shooting?
 
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Old 07-16-16, 08:48 AM
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Try changing the fan speed. What is the make and model number?
 
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Old 07-16-16, 08:54 AM
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Welcome to the forums.

Sorry to say..... it's time for a new motor.
 
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Old 07-16-16, 09:56 AM
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The furnace is a Carrier 58PAV.

The motor was just replaced a few years ago, is it reasonable to need another motor so soon?
 
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Old 07-16-16, 10:24 AM
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If it was a generic replacement it could be.
 
 

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