Have Ford Questions? Ask a Mechanic for Answers ASAP
Hi. There is a temperature blend door actuator on the rear auxiliary unit. THis is what changes the temperature from hot to cold. You can remove the rear trim panel and inspect the actuator and see if it is moving when you are changing the temp.
I am unavailable for calls right now. But the actuator is on the passenger side in the way back of the truck.
Not for the call.
I do have access to service manual instructions if you are doing this repair yourself.
Let me know if you have more questions on this please.