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 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?