03 expedition back passenger heater not working

[godiegogo81]

Hey y’all, my back heater is not working on my 03 expedition. A/c works fine just the heater for passenger.Btw Front heater works perfect . Any recommendations tips or ideas thank you all.

 

[kep5niner]

Do you hear any clicking sounds from the back right interior? The blend door actuators commonly fail, and there are two in the rear. They could have failed in the position only allowing cool air to pass. They are inexpensive, and pretty straight forward to replace. FordTechMakeYouLoco (Brian) has a great video on YouTube that walks you right through it.