I recently purchased a 2013 F-150 Limited. I live in the Houston area. Yesterday was the first day it was cold in my new truck. I set the heater on 74 but noticed my feet were cold. After some time, I started feeling my vents. No matter what temp setting or changes I make the drivers side temp is cold. The passenger side will blow warm or hot if I change the temp but the drivers side only blows cold.
Is this an expensive fix? Any advice would be highly appreciated.

 

The pass side temp works correctly.
The driver side temp does not change.
The mode(location of airflow) works correctly on both driver and passenger sides.

From what I understand all three above statements are true, is that correct?
If it is correct then you will need to replace the driver side blend door actuator.

 

Just today my truck began blowing cold through all vents on the drivers side.... however, it blows whatever temp (double zone) you set it to on the traveler side. Has anybody had this occur and is there a fast simple fix?? Kodi nox

 

If you read the previous post you would see it is recommended to replace the driver blend door actuator.
You can find youtub videos on how to replace it, spend a little more and get a ford part, issues with potentiometers in aftermarket actuators.