AC Makes Buzzing Noise at the End of Cycle


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Old 07-19-11, 06:29 AM
J
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AC Makes Buzzing Noise at the End of Cycle

I have an AC unit on the roof, ducting and central air, thermostat, etc. That kind of set up. It's also provides heat. Its a Carrier 48GS/GX gas/electric Packaged Unit.

It works fine. Recently, at the end of the cooling cycle when the compressor turns off but the fan still runs, there's a buzzing sound. It reminds me a bit of the sound a the air break on a tractor trailer makes, if you've ever heard that.

This doesn't happen all the time. I'd say it happens about 1 out of every three cooling cycles. By cooling cycle I mean when the AC comes on and goes off.

Any ideas of what is causing this?
 
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Old 07-19-11, 08:10 AM
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The forums are moving fast today. Bump.
 
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Old 07-19-11, 05:49 PM
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how long does the sound last?
 
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Old 07-20-11, 08:27 AM
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I'd say no more than 30seconds. Sometimes it's just for 5seconds. It' loud enough for the neighbors to notice. It sounds a bit like an air compressor you use to blow up a car tire.
 
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Old 07-20-11, 10:32 AM
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i'm having a hard time figuring out what it may be without hearing the noise myself........
 
 

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