2002 Jeep Cherokee hot air from right side with a/c

Air Conditioning problem
2002 Jeep Cherokee 6 cyl Four Wheel Drive Automatic

hey i put a heater core and a new blend door assy in this jeep and the right side is blowing hot air out but the left is cold as ice what is up? i have checked a/c charge and is ok,checked vac at all actuaters and all are ok, i have no clue what is up. i asked the dealer but got no where. ps this is a single blend door system. and the door works fine. i hope you can help. thanks