Here is the test: http://www.wjjeeps.com/climate.htm
Keep in mind that if the motor doesn't find the resistance for the door to stop, (in other words, fails) it will shut down that side until power is turned off and turned back on again.
Since you already have it cut open, put the blend doors and shaft in (if you haven't already) and let it calibrate, then run the test. Or, you can just power it on and change it back and forth from hot to cold. If the passenger motor doesn't move, a last ditch effort will be to unhook your battery for about 20 minutes, re-hook it, then start your car and run the dual blend doors from hot/cold.
I replaced my blend doors two or three years ago. Last month, I have had my car blow hot air on one side, twice in a month, and the only thing I could do was unhook my battery for a bit, and it went back to normal.
If the actuator motor for the passenger side doesn't work, it will require dash removal to replace that one. Sorry.
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