The subject is a furnace in a rental property, currently vacant. I believe the motor has failed. I hear a faint humming noise when the motor should be running but the fan is not operating. The furnace model is GMH950703BXAC. I found a source of parts at the link below:
https://www.repairclinic.com/RepairH...-GMH950703BXAC

I watched a video at the above link. It mentions the capacitor as another possible cause of a fan not running. I have not had a chance to look at the capacitor yet.

Many years ago, I replaced a fan motor in the furnace in my residence. My furnace then was a Carrier. I presume the procedure will be very similar in this case. Some screws will have to be removed to let the fan/blower housing be dropped and removed. Then, disconnect the wires connected to the motor, detach the old motor, mount the new motor in the blower housing, re-connect wiring, and reinstall the blower housing.

Does this sound like I'm on the right track?

 

It could be a bad capacitor. It's the easiest and least costly thing to replace first.
I've rarely found a bad cap on a blower fan.

The typical problem is the front bearing is worn due to the weight of the squirrel cage wheel hanging on it. The blower assembly will slide out for motor replacement. You may need to soak the set screw and motor shaft with some rust eater like PB Blaster to make removal easier.