2010 chevy express 3500 passenger van the AC in the rear doesnt blow much but it doe get cold.

 

How does it react to the speed dial?

 

The front does, I know that's a vacuum leak with the check valve. I think I found the reason for the rear. I took off the panels to expose the rear blower and noticed the duct going from the blower to the ceiling vents was separated.

 

I noticed mine appear to be warped from heat or something. They don't fit together snugly anymore.