I've got funny problems with my air con. It's all nice and cool, then suddenly it's all hot air!
Have to turn it off then on, and if i'm lucky, it's all cool again.
If I'm unlucky, I have to pull over and shut the car off then on, and it may work.
If I'm really unlucky, I have to pull over, shut car off, pop bonnet and pull out aircon relay, put it back in and it'll work.
I felt I had to share this with fellow NSW people.