Originally Posted by floridasunflowers
Hi, I'm new here and not sure if this is the correct place to post this. If not, maybe someone can lead me in the right direction.
I have a 2000 Ford F150 that I bought about a month ago. Everything was running fine and it still runs fine. I've noticed in the past 3 days a loud humming/buzzing sound coming from under the hood. Almost piercing. Now I was told when I bought it that the A/C was not putting out much cold air and I have not even been running it but was under the impression that the fan runs anyhow regardless because it is hooked into a serpentine belt or something? I may be way off here, not sure if that info is even correct.
Would just adding some freon make the humming/buzzing sound go away or is this maybe a sign of something other than the compressor on the a/c.
Thanks for any direction!
The compressor isn't turning even though it's got a pulley with the belt on it. There's a clutch that pulls in that actually turns the compressor once you turn the a/c on. Maybe there is a bad bearing in one of the parts on the belt though. Adding freon wouldn't make any sounds go away. You could take the belt off and start spinning things, and see if you can feel something turning rough or making noise though.