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PaperclipPerfector  1d ago (text post)   719 thread views

Wellness Wednesday for April 15, 2026

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Following off @hydroacetylene's thread here, I will add condensor fan motors as something that a barely-competent techie can replace. It's annoying, but it's annoying in a 'fucking screws' sense, and not a 'ohgodimightdie' one. Big things to watch out for :

  • As for any work inside the outdoor unit, make sure to completely power off the air conditioner by pulling the fuses and/or breaker, verify that it's powered down, and discharge the capacitor.
  • The fan blades are easy to bend, and very sharp.
  • Take photos of the contactor and capacitor before removing any wire, and do a check and review before reinserting the fuses.
  • Expect to need to crimp at least three and possibly up to eight wire ends, and cap off one or two unused ones. I like insulated disconnects, and they're a half-buck at your local hardware supply company. No idea why so many of these parts come with 50% of the wire ends pre-crimped.
  • Wire management is very important, especially near the fan itself. Those sharp blades love to eat cable. Most air conditioners have wire runs, and they're completely inadequate. I went nuts with zip ties, but there's probably a better solution.
  • The fan blade hub usually 'connects' with a square screw to the motor's output D-shaft. Don't want to torque the bearings or bend the shaft itself, but you gotta throw a ton of muscle to get the screw to bite in well. I threw on some locktite blue because I'm neurotic, but that's probably overkill.
  • Almost all replacement motors come with comically long output shafts, especially for the 10+ year old units that are actually going to need new motors. Sometimes, that extra length will just look goofy, but it might also rub against the compressor shroud. Cutting it to size is Not Fun, but it's doable with a dremel cutoff wheel or a metal hacksaw. Some shops will offer to do it for you.

If you're doing this, you might want to swap out the contactor and capacitor too, just because you'll be getting 90% of the way through them anyway. It was 15 USD for the contactor, 30 USD for the capacitor from a Home Depot (and a different vendor sold me a spare for 20 USD), and motor was 200 USD. You can get the motors cheaper (sometimes worryingly cheap) online, and that might be the better option for many people, but I'm lucky enough to have a small general-purpose shop that still sells to the public. We'll find out if it's more reliable than Amazon's VEVOR, but since the latter promoted itself as anti-explosive...

I will caveat that if the fan's not moving or only moving sporadically, and you didn't catch it quickly, there's good chances it caused compressor damage. I got lucky, since the motor had been alive last fall and didn't spin when I was doing a seasonal startup test and cleaning, but from everything I can find online the compressor over-temp and over-pressure safety switches are not very reliable if the fan just dies in the middle of the day.

You definitely can't (legally or safely!) replace the compressor as a casual DIYer, and it's pretty common for a bad compressor to mean just replacing the whole outdoor unit. So you want to keep ahead of problems here rather than hoping and praying, if the blower motor's even slightly unreliable.

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