Bump. Good question.
The air started blowing hot on the driver side while still blowing cold on the passenger side. Everything on the internet says it's most likely the blend door actuator. I replaced the driver side blend door actuator and still the same problem.
I then used a recharge kit and that seemed to fix it for a couple days. Now the air is blowing warm-to-hot on both sides and takes forever for just the passenger side to get cold.
Any advice on how to proceed next would be greatly appreciated.