Blend doors GMC Yukon Denali

[JoJoJim]

I have replaced all the blend doors on my 2007 Denali ver the years and now I have another issue.  The passenger side goes to hot while AC on after driving for awhile.  It will not go back to cooling temperature until setting for awhile.  I cannot determine which blend door it might be.  The last one I replaced was the difficult one up under the dash near to the firewall.  These are really frustrating to deal with and definitely a weakness with this vehicle.