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With last night’s storms and the extra-high humidity today, I turned the air conditioning on before going to bed last night. While working in the basement this morning I heard an intermittant squealing sound coming from the the furnace blower while the air conditioning was running. This wasn’t a good sign, but I figured I could just keep an eye on it and see if it gets worse. Then, sometime around 1pm, the AC was no longer working.
Reaching inside of the furnace and turning the fan by hand (with everything powered down, of course) found it to be rather stiff, and almost stuck, meaning that the bearings in the motor had likely failed. After removing the blower unit and playing with things, I found that the motor was now turning a bit better. With a replacement likely needed in the future I pulled the motor itself, then took the picture above to document the model number.
Looking further, I noticed that the motor has a ‘TOP’ marking, and right below this are two oil inlets. (One of these inlets can be seen above on the bottom part of the motor, sticking out in line with the shaft cover.) Hoping to loosen up and lubricate things a bit, I dripped a bit of Tri-Flow down into the holes, spinning the shaft some more. With the shaft moving better I reassembled the blower unit, put everything in the furnace back together, changed the air filter, and tried it out. It works, with no more (for now) squealing. Yay! Hopefully it’ll keep working. I’d rather not have to buy a replacement.