Passenger side seems to only have fresh air

Hi Roger,

If you mean the temperature on the passenger side doesn't change, that is related to a blend air door actuator. You could remove it to confirm it doesn't move when changing temps. However, this is the likely cause.

Here is a link showing in general how it's done:

https://www.2carpros.com/articles/replace-blend-door-motor

Here are directions specific to your vehicle. The attached 3 pictures correlate with the directions.
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2010 Ford Truck F 150 4WD V8-5.4L Flex Fuel
Temperature Blend Door Actuator - RH
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Removal and Replacement Temperature Blend Door Actuator - RH
TEMPERATURE BLEND DOOR ACTUATOR - RH
412-01 Climate Control 2010 F-150
REMOVAL AND INSTALLATION
Temperature Blend Door Actuator †RH

pic 1

Item Part Number Description
1 W701696 Temperature blend door actuator screw (2 required)
2 †Temperature blend door actuator electrical connector (part of 18B574)
3 19E616 Temperature blend door actuator
Removal and Installation

Remove the Audio Front Control Module (ACM) . For additional information, refer to Section 415-00 .
While pushing the glove compartment door tab, position the glove compartment downward.

pic 2

Detach the 2 wire harness pin-type retainers and position the wire harness aside.

pic 3

NOTE: The forward RH temperature blend door actuator screw can be removed with a combination wrench. With one hand working through the ACM opening, hold the top end of the combination wrench. With the other end of the combination wrench pointing away (toward the right front corner of the vehicle), and with the other hand working through the glove compartment opening, the combination wrench can be manipulated.

Remove the 2 RH temperature blend door actuator screws.
Detach the temperature blend door actuator.
Disconnect the temperature blend door actuator electrical connector.
Remove the temperature blend door actuator.
NOTICE: The ignition key must be off when replacing the actuator. Energizing the actuator before installation will cause the part to become positioned incorrectly and proper orientation will be lost. Incorrect actuator operation will result.

To install, reverse the removal procedure.
NOTE: The purpose of the module actuator position calibration is to allow the HVAC module to reinitialize and calibrate the actuator stop points. To carry out calibration, carry out the following steps.

Remove Smart Junction Box (SJB) fuse 15 for at least one minute.
NOTE: When the ignition switch is switched to the ON position, the HVAC module will initialize and calibrate the actuators. Calibration of the actuators will take approximately 30 seconds.

Reinstall SJB fuse 15. Turn the ignition switch to the ON position and wait 30 seconds before verifying correct mode door actuator operation.

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Let me know what you find or if you have other questions.

Take care,
Joe