HVAC Blower motor issues (capacitor?)?

If it's been doing it for a year, it may be time to replace it. Seriously, I've never heard of one that is temp. sensitive. usually this behavior denotes a need for new brushes in the motor. if it is a brushless motor, it has developed a flat spot, possibly from arcing, where the contacts meet the rotor, your hand spinning is taking it past that spot. I would try to replace the capacitor if it's cheap, but I dont think it will help. You may need a new motor.

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HVAC Blower motor issues (capacitor?)?

The blower motor in my furnace has been acting up for the past year and I am hoping someone can help me diagnose it. The blower seems to start up just fine when using it for heat but when Summer comes along and I use it for A/C the motor will try to start and just hum for a while. If I switch it...

Hvac Start Capacitor

The issue is with the actual motor itself. Your motor use two different speeds. One for heating and one for cooling.

The issue is with the windings in the motor. You would be best off replacing the motor and capacitor that matches you new motor.

So when its in cooling the windings for that part of the motor are bad and the motor can not start on its own. Its not a capacitor issue if this does not do this in heating. All signs would point to a bad motor.

the tell would be to set the speed tap on the motor to the slower speed in cooling mode. if it runs normally than yes, you have an issue with the windings or with the connection at that particular speed tap. yes you could swap out the motor but I actually drop down the speed of my indoor blower motor because I want to dehumidify my living space properly.

I would swap out the cap anyway because the higher speed that is used in cooling draws more amps than the lower speed in heating at startup. this extra huuumpf might be the capacitor not able to kick it in and why you can start it by hand. Run capacitors for blower motors are cheap online and you can read the name plate to match the MFD rating - probably a 5 mfd or 7.5 single run cap. here is a video on how to swap them out and on the blower assembly as a whole.

https://www.youtube.com/watch?v=SPIZEFzalgI

run capacitor info vid

https://www.youtube.com/watch?v=_hnVcfXqjnY

The heater runs the fan on a slower speed than the AC so it may be a coil problem but from what you say it may be the cap.

Usually if you can spin the fan in the wrong direction and it runs in that wrong direction then it is a cap. Problem.

reset the blower motor