Question about Heating & Cooling
Hi, from what you have told me, you are loosing the bearings in this blower motor along with windings. This motor is rubbing the blower housing, tight when you turn it, and when it jerks when it tries to start tells me that you have burned or very weak windings. The run capacitor may also have failed causing this motor to try and start, but will not if this run cap has leaked oil, or has shorted and open internally. It will be a 5 to maybe a 7.5 uf microfared x370 volt run capacitor that should be mounted to the side of the blower housing. It will have terminals on top that the brown capacitor wires connect to. Look it over to see if the top or any where on it is swollen, cracked leaking out oil, or burned. This capacitor starts this motor and keeps it running up to speed. When a capacitor fails, it is usually caused by the blower motor over amping due to over heating because of the windings and worn bearings. You will need to replace both the motor and the run capacitor. By what you have told me the motor is doing, changing out the run capacitor alone will not solve your problem, as it also has bearing problems as it is rubbing. Also, you can get a roll of rubber back a/c tape with a aluminum backing to try and insulate the evaporator box better to prevent this condensation from ruining the controls and shorting more out. This tape is at Home Depot.Yes this motor has a lot of resistance and will not spin freely, due to worn and tight bearings that has caused this motor to over heat at some point doing damage before it could trip on its internal over load. When installing a new motor, depending on this furnace, the motor, blower housing and all with a couple of screws removed will slide right out so it can be taken out doors to remove the faulty motor and clean up the blower wheel as dirt collects on the wheel vanes causing drag and wear on a new motor as well as reduced cfm. If you are planning to take this on your self, mark all wires from the motor and run capacitor, and you may be able to find this motor at a retail appliance parts only house. If you know any contractors you can get one through a wholesale a/c parts house. Also, Granger's is a excellent place to get a motor open to the public and contractors. I wish you the best on this and I know for a fact that this motor is your problem, so replace it and the run capacitor and you will be up and running. Please don't forget to rate me and I know you will be kind to me. I will be checking in to see how it is going for you, so you can also keep me posted.
A/C, Heating, & Refrigeration Contractor
Posted on Aug 30, 2010
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Posted on Jan 02, 2017
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