AC Makes Buzzing Noise at the End of Cycle

jotoboJuly 19, 2011

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 cools 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. How much will a repair cost?

Thank you for reporting this comment. Undo
heatseeker

There is a difference between a buzz sound [electrical] and a whoosh sound [pressure] find out which one it is and write again. If electrical could be contactor if pressure could be compressor.

    Bookmark   July 19, 2011 at 3:35PM
Thank you for reporting this comment. Undo
jotobo

It's definitely a compressor type noise. Like the sound an air compressor makes as you pump up your tire.

    Bookmark   July 19, 2011 at 4:33PM
Sign Up to comment
More Discussions
advice about replacing furnace
I have a 1000 square foot rental house with a 40 year...
Ann Weaver
Does Air Duct Cleaning really help?
We live in a 40 year old home with a forced air gas...
lincann
Need help with selecting Eff Heat Pump replacement.
20 yr old American Std Heat Pump stopped working. ...
2015hvac
Is this HVAC system OK?
Replacing original old ~9 seer unit. House is 2001...
thereloader
Advice on Attic insulation
So we just finished the second year in our house and...
w_fournier
Sponsored Products
Cedar Extra Wide Closet Storage
Home Decorators Collection
Artemis Toilet Paper Holder
Signature Hardware
Modern Indoor/Outdoor Accent Rug: Artistic Weavers Rugs John Brown 2 ft. x 3
$58.97 | Home Depot
Stein Word Sterling Accent Chest
Beyond Stores
Sterling Finesse 5375EZ-47N 47.25W x 70.3125H in. Clear Glass Shower Door - 5375
$711.99 | Hayneedle
Habersham Trouville 105H Breakfront
LuxeDecor
Sea Gull Lighting Wall Mounted Lambert Hill 1-Light Outdoor Oxford Bronze Wall
$96.75 | Home Depot
Graff | Sento Floor-Mounted Lavatory Faucet with Single Handle
$2,011.50 | YBath
© 2015 Houzz Inc. Houzz® The new way to design your home™