Most annoying thing ever. If I'm running my A/C, this noise comes and goes consistently. This only started happening when the shop replaced my a/c compressor. Here is the video: I have already replaced my blower motor, so that is not the issue.

 

When you turn the snowflake button on and off you are turning the compressor on and off. When it's making the noise see if you can hear the compressor making a similar noise from under the hood.

 

Right. I'll doublecheck but I could swear it's right there. I'll update today since it's warm out

 

that sound is definitely coming from behind the dash. it comes up probably twice a minute. you can hear a very faint click which I assume is the compressor cycling, and then this noise spins up.