i have a rattle in the headliner just above me to the left. above the driver door right in the area of that small microphone (i assume that is the microphone for onstar?)

how can i get this to stop? anyone else have this rattle?

it seems to rattle more right when i start the engine up and the truck is idling/not moving and it goes away or isn't as prevalent later after it warms up and i'm driving.

 

ok - did a little more reading and it seems that little circular thing i thought was a mic for onstar may actually be the temp sensor for the auto a/c. that is where the rattle is coming from. if anyone has experienced this or knows how i can fix it i would appreciate it.

thanks