I have a 2007 Chevy Tahoe with Dual Temp Controls. The drivers side pumps out nothing but hot air no matter what the setting while the passengers side and rear are just fine. What can I do?

 

the temp mode door actuator may not be moving when commanded. locate the actuator and see if its moving the blend door when the temp **** is moved.

 

I would also suggest the "relearn procedure" as a quick and easy place to start...
Remove the HVAC fuse for 10 seconds, re-install, turn key to start ignition off for at least 1 full minute and let the HVAC system relearn its positions...
Do not adjust any settings during that time...

If my battery goes dead or I disconnect the battery, I usually have to go through this procedure...