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What is it NOT doing?
Okay, I assume the filters are clean?
Lets be clear. The outside fan is not what blows air through your ducts. That being said are you feeling less air through the vents than usual?
No, the capacitor just helps the fan to get going. So you are getting ZERO airflow through the vents?
Where did you replace the capacitor? Indoor unit or outdoor?
Well that only helps the outdoor fan, which isn't the issue. Is your indoor unit in the garage.
Okay is it also your furnace?
Does your thermostat call for a/c by saying "cool" on display?
Okay make it call for "cool" then go into the basement and see iff fan is blowing at all.
Okay is your furnace electric?
Sorry for the delay, you should have two breakers for the furnace one at the furnace and one at the breaker panel. Check them both.
Can you spin the squirrel cage style fan in the air handler? Spin it hard!
Do you have a multimeter?
Okay then I think you have a bad start capacitor on that fan motor. The humming is because its not getting enough of a boost. It could be a bad fan motor, but I'd start with the capacitor. They are much cheaper.
Did the fan spin at all?
Put the cover back on and see if it'll work now.
Well, its got power. If it isn't moving its the motor or the start capacitor.
If the windings in the motor were bad it would trip the breaker, so I'd lean towards the capacitor.
Any other questions?
Are you satisfied with my service? Or shall I keep this question open?
Take it to the local hvac supply like a Johnstone supply. They should have one. Let me know when you are willing to rate me and I'll activate it. It is the only way I get credit for my time.
I can still leave it open even after the rating
Follow the wires from the fan motor to the capacitor. Some motors have them on the motor themselves. I'll load a picture of each
Here it is on the motor under the case indicated by the arrow. (not common in fan motors but do exist)
here's the more common style. He's pointing at the capacitor
I've got to head to bed. Good Luck!
how'd it work out for you?