No hot air from the driver vents but all the other vents blow hot air.

Hi this is Dusty, I'm one of the auto experts on RepairPal's Car Genius team. It certainly has some form of diverter valve, but it directs coolant into the heater core which supplies the heat for the cabin. As for the temperature control module, if the cooling portion works and the heat is the sole issue, it's more likely that would turn out to be an unnecessary repair. If the cabin were constantly cooled with no change according to the temperature selection at all, I would agree it could be the cause. But it sounds more like the heater core is clogged on the driver's side, I see you mentioned you've had it flushed, but those passages are ridiculously small, and ridiculously hard to clear without potentially causing a coolant leak in the cabin. If you have any questions, give us a call at (877) 913-1554