Anyone else get a creaking noise when they shut off the a/c?

i noticed it a while back and its came ant went but its getting worse and more frequent. I dont want to go to dealer theyre just going to say "cannot replicate" is there somewhere i can just grease up a gasket? thats kind of what it sounds like... any suggestions welcome i have no idea what components are in an a/c system im imagining some kind of duct valve with a gasket on it...

 

When the A/C turns on or off, usually it's activating the recirculation function (on Auto). That closes a flap inside the ductwork, which you can hear if it's quiet in the cabin.

 

Ok thanks it was bugging me I never noticed it before but yah it's really only when its quiet and when I'm turning it off.