My dad has had problems with the Driver’s side A/C in his '05 Tahoe. It only blows hot.
He just had the evaporator core and heat core replace. They added the blend door actuator that was missing (from a Midas “replacement” job), and it worked for a day or so, and now hot air only.
The mode (defrost, floor, head) function works, the passenger side temp blend works, but the drivers temp does not. As mentioned above, the actuator has been replaced a couple of time and every time the temp works a few days and then heat only.
Is there some kind of temp sensor that needs to be replace?
Any other ideas?