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When the temp output is only correct on one side of the dash, this can be due to a faulty Air Mix Actuator. This is the motor that turns the door internal of the HVAC housing to switch between heat and A/C as commanded by the control panel. The passenger's side actuator is located behind the glove box, mounted to the side of the HVAC housing. Inspect the electrical connector and wire harness for any loose, broken or damaged wires. If the visual inspection checks ok, remove the actuator and turn the door pin by hand. The temp output should now be correct. If not, the problem lies internal of the HVAC housing. It will need to be removed, opened and repaired as needed. If the output is now correct, replace the Air Mix Actuator. For an image view of tghe actuator location, click here:https://www.dropbox.com/s/wdr64bkda5lcsrz/sub-act.jpg?dl=0
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