A/C is not blowing cold or hot on the driver's side

Welcome to 2CarPros.

Chances are the blend air door actuator for the left side has failed. This actuator is what is responsible for determining the air temp entering the vehicle.

Here is a link that explains how in general one is replaced:

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

Here are the directions specific to the left side on your vehicle. The attached pictures correlate with the directions. Also, the linkage may have come off, so you will need to inspect its operation and condition.

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2008 Ford Truck Edge AWD V6-3.5L
Temperature Blend Door Actuator - LH
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Removal and Replacement Temperature Blend Door Actuator - LH
TEMPERATURE BLEND DOOR ACTUATOR - LH
TEMPERATURE BLEND DOOR ACTUATOR - LH

pic 1

Removal and Installation

NOTE: It is not required to install the new LH temperature blend door linkage parts included in the LH temperature blend door actuator service part kit if only the temperature blend door actuator requires replacement and the linkage parts are not broken or binding.

LH temperature blend door actuator and linkage
1. Remove the 2 lower steering column opening cover bolts.
2. Detach the lower steering column opening cover.
3. Disconnect the in-vehicle temperature sensor aspirator hose and electrical connector.
4. Position the instrument panel wire harness away from the LH temperature blend door actuator.
5. Remove the 3 LH temperature blend door actuator screws.
6. Disconnect the LH temperature blend door actuator electrical connector.
7. Remove the LH temperature blend door actuator.
8. Manually operate, and inspect the LH temperature blend door linkage for incorrect placement, binding or damage.

LH temperature blend door linkage only
9. Detach the 2 retaining tabs and remove the LH temperature blend door linkage.

pic 2

LH temperature blend door actuator and linkage
10. To install, reverse the removal procedure.

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Let me know if this helps.

Take care,
Joe