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The most likely problem will be the temperature blend door actuator for the passenger side. What you might want to try is tapping on it with your finger tips and see if it will move.
Or, you can take it out and see if it is moving when you command it to. Also, make sure the blend door itself is moving freely while you have the actuator out.
Here are the steps for the actuators, you will want to check the passenger side, air mix
INSTALLATION Install in the reverse order of removal.
It is under the dash, You might need to remove the lower trim, (hush) panel to get to it better, here is another locator for the HVAC components.