Air conditioning rattle

[EerFanInOtown]

I have a 2017 Tahoe. There is a rattle that appears to be coming from the back seat roof A/C vent. Is there a fan blade up there, somewhere? When I turn off the AC after hearing it, the noise stops. So, I’m confident that it is AC-related.

 

[Tahoe14]

Turn the AC on and push on the one that is making the noise and see if it stops. If so pop off the vent and put a small piece of insulation on the vent and snap it back into place. If it is still under warranty let the Dealer fix it.