After a recent servicing and I noticed this fitting on the firewall on the passenger side. I am crossing my fingers this may be a factory blank for a pass through to the dash. Anyone know if it is?

 

When you have a sunroof, that is where it drains, unless of course it gets plugged up with crud.

https://www.hummerforums.com/forum/h...n-tubes-28548/

 

Just found out it is the AC condenser drain. after driving it yesterday home from work with the AC on max, I looked under the hood and seen water dripping from it and it was ice cold. Does the sunroof drains drain into same tube?

 

just pour a cupfull on left and right side and see. its a test for good drains.

 

The sunroof drains exit behind the plastic fender liners, front and back.