My 2005 Chevy Silverado with dual zone climate is occasionally blowing hot air on the driver's side and cool on the passenger. It usually works fine for a few minutes before it begins blowing hot air. Once it starts blowing heat, it seems to continue until I park for a while. It doesn't always have this problem.
I'm guessing it's a vacuum or electric problem. I assume that low refrigerant would cause both sides be hot.
Any ideas? I'll probably be taking it to a dealership, but I'd like to know more about the problem before I do that.