Help finding an answer with A/C issue

[LT1ZOB]

I’m almost positive I’ve seen it on this forum, but can’t find the thread I’m looking for. Once in a while, when I come to a stop, i here my AC buzzing. Not annoying, loud buzzing, just sounds louder than it should be. As soon as I shut off the AC, the noise stops. It happens very seldom, most of the time all is quiet and normal.
I remember reading something about this here, but then again, I’m on 3 different GM forums and sometimes get my info mixed up. Anyone know what I’m talking about? I remember it being a fairly simple solution like rewrapping the AC line entering the firewall??? Please help if you can.

 

[LT1ZOB]

Bump. Trying one more time

 

[BG1988]

I’m almost positive I’ve seen it on this forum, but can’t find the thread I’m looking for. Once in a while, when I come to a stop, i here my AC buzzing. Not annoying, loud buzzing, just sounds louder than it should be. As soon as I shut off the AC, the noise stops. It happens very seldom, most of the time all is quiet and normal.
I remember reading something about this here, but then again, I’m on 3 different GM forums and sometimes get my info mixed up. Anyone know what I’m talking about? I remember it being a fairly simple solution like rewrapping the AC line entering the firewall??? Please help if you can.

second fan

 

[LT1ZOB]

second fan

Sorry, not following your comment. Can you be a bit more specific? Thank you

 

[BG1988]

the second radiator fan.. on HIGH MODE


other wise it's perfectly normal..

 

[Big Mama]

Is it a new problem?

 

[Rocket Man]

Unplug the fans next time it happens and see if it goes away.

 

[LT1ZOB]

Thanks guys. So are you saying it’s normal? The second I shut the AC off it goes away, never unplugged the radiator fans

 

[Rocket Man]

Thanks guys. So are you saying it’s normal? The second I shut the AC off it goes away, never unplugged the radiator fans

Have you opened the hood to try and listen where the noise is coming from? It could be the compressor or clutch too.

 

[LT1ZOB]

Have you opened the hood to try and listen where the noise is coming from? It could be the compressor or clutch too.

I have not. I’m familiar with compressor noise, I wouldn’t say it’s the compressor. It happens seldom, it’s almost like a noise frequency