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Old 04-15-2014, 09:27 PM   #16
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Noisy compressor


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Originally Posted by miamicuse View Post
Hi after searching online I found a place that carries the motor.

I think it is this one:

http://www.acfurnaceparts.com/search...se&category=24

68J97 Lennox - Fan Motor

Your Price: $276.40

Is this right? Do I need anything else? Do I need to change out the capacitor too at the same time?

Thanks for all the comments and suggestions so far!
I think you should do some research and educate yourself on the various components of your outside unit (and indoor unit), gain some general knowledge about the units so you can talk at a similar level to those helping you (not me, I'm not a tech), and show a genuine interest in learning to troubleshoot not just throw parts.

This whole video won't apply to you but the first couple minutes show you how to troubleshoot a bad fan motor. It also discusses the cap and how to test if it's good or not.



Throwing parts at a unit is never a good idea IMO. Me personally, I would never buy a $300 part without doing some diagnostics first, at least pull the shroud off and feel the shaft/bearing play on it.

Prior to that the extent of my knowledge about AC units was about zero. Guys here helped me understand the components and taught me how/what to troubleshoot. This is a great resource but you need to put in the effort on your side IMO.

Here is the multimeter I used, don't forget your 25% coupon:
http://www.harborfreight.com/5-in-1-...ter-98674.html


Last edited by wheelsup; 04-15-2014 at 09:33 PM.
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Old 04-15-2014, 11:38 PM   #17
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Can someone explain what the abnormal noise is here? These things are noisy by definition (60-80 dB), and you will hear them inside the house, especially when they're right by a window.
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Old 04-16-2014, 09:26 AM   #18
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It is not abnormal but louder than when new as the bearings are worn in it and possibly the fan blade is off balance from running that way for a long period of time. Most people don't care or want to spend $$ and run it that way until it stops.
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Old 04-16-2014, 11:21 AM   #19
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Originally Posted by wheelsup View Post
I think you should do some research and educate yourself on the various components of your outside unit (and indoor unit), gain some general knowledge about the units so you can talk at a similar level to those helping you (not me, I'm not a tech), and show a genuine interest in learning to troubleshoot not just throw parts.

This whole video won't apply to you but the first couple minutes show you how to troubleshoot a bad fan motor. It also discusses the cap and how to test if it's good or not.



Throwing parts at a unit is never a good idea IMO. Me personally, I would never buy a $300 part without doing some diagnostics first, at least pull the shroud off and feel the shaft/bearing play on it.

Prior to that the extent of my knowledge about AC units was about zero. Guys here helped me understand the components and taught me how/what to troubleshoot. This is a great resource but you need to put in the effort on your side IMO.

Here is the multimeter I used, don't forget your 25% coupon:
http://www.harborfreight.com/5-in-1-...ter-98674.html
I understand your point, and yes I admit my level of knowledge about AC is nil.

If the unit isn't working and I am not sure what's going on, I would go through online searches, FAQs, youtube videos to point me in the general direction of where to start trouble shooting.

However in my case my issue isn't something not working, it is just noise that to see seemed excessively loud. It's subjective. For all I know it may be normal and it's me and once I noticed it I can't seem to not notice it anymore.

So the question is a combination of whether this is normal or whether this is too loud. I doubt a multimeter, which I have one, will help in that regard.

My original search most of the online solution were pointing to using sound blankets. That may solve the problem, except in my case it sounded to me the noise is mostly on the top side of the unit, hence the reason yuri asked me to record a youtube video.

I would like to diagnose more I just don't know how taking the unit apart would help me isolate a noise issue which I am still not 100% convince is normal or excessive.

Last edited by miamicuse; 04-16-2014 at 11:24 AM.
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Old 04-16-2014, 11:28 AM   #20
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Can someone explain what the abnormal noise is here? These things are noisy by definition (60-80 dB), and you will hear them inside the house, especially when they're right by a window.
You are right.

I mentioned in the beginning it is a room I rarely enter, a guest bedroom.

I am expecting a guest soon and when I went inside to set up the room that's when I noticed the noise. It was loud enough with windows closed for me to thought it was a plane flying by overhead. Then it occurred to me it's the AC outside. Since then it's been bothering me because now that I noticed it I am wired to notice it more.

Two years ago I had an AC tech come by because the handler stopped working - it froze there was a sheet of ice on the inside. He told me my units are both living on borrowed time and quoted me a new set for about $5500.
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Old 04-16-2014, 11:35 AM   #21
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Does not sound abnormal to me. Why spend $$ if you don't have to.

Those blankets we use on newer Scroll compressor units as some have a different pitch in sound than the old reciprocating ones which you probably have, Not going to do much for you and you may not find one for a recip easily.

Seriously, I worked shift work and use those disposable foam ear plugs to sleep in the day. If the guest has a problem try them. They are comfy.
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Last edited by yuri; 04-16-2014 at 11:39 AM.
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Old 07-26-2014, 11:40 AM   #22
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For my noisy fan on the AC Unit outside, I use bungee cords. Just hook them to the top and sides and that reduces the noise/rattling significantly. At least for noise coming from the wires rattling.
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Old 07-26-2014, 09:54 PM   #23
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Try a well placed brick on top of the condensing unit centered on the fan motor!

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