Hey, hopefully this will help someone in the future. 2010 ram 1500 4x4 cab 5.7 hemi center console shifter
PROBLEM: Passenger side heat/air would not turn on unless the truck had been running for several minutes. Grinding noise was heard behind dash. Eventually resulted in it never coming on and the defrost stopped working entirely.
SUSPECTED ISSUE: We believed the dreaded 5th actuator on the back of the box was broken. (We were correct).
REPAIR: We dropped the dash off (several helpful videos on this)[may want to remove seats, we didn't but the extra room would have been nice]. We were afraid we would have to drain the refrigerant in order to move the box out where we could replace the part. We did NOT have to drain the system. We undid the bolts in the engine bay except for the one in between the ac lines. We disconnected the plastic vent/air transport (located on drivers side on the bottom of the box)[it is a pain to take off and put back on but still better than rechargingthe system]. This allowed us to swing the box out and pull it in (the ac lines and heater core lines will come in the truck a couple of inches)[part of our box was melted a bit to the firewall and took a bit of encouraging to get off] enough to access the actuator. We used a dewalt 90° angle bit holder with one longer phillips bit and one short one to back the screws out and replace the actuator. The actuator arm was broken off and stuck in the box. Used needle nose pliers to remove.
Hopefully this helps someone in changing out that actuator on the back of the box.
SIDE NOTE: There is a gray plug on the passenger side door. Ours had tape around it. I started to unplug it and stopped because it didn't need to be unplugged. Apparently I didn't push it back together enough (didn't recall pulling it apart any at all) but apparently I did. It knocked out the instrument cluster, the 4 wheel drive, caused the wipers to turn on and not stop, and other problems that caused my dad (it is my dad's truck lol) to have an extra day of trouble shooting. Truck also was driveable with all of the stuff messed up. Hopefully no one else make this mistake lol.