Haha. Funny you say this.
Went to have mine gasses the other day. Pulled up to my mates, switched it too cold and waited before knocking the car off to let the cold air through. Wouldn't do it. Would not turn too cold what so ever.
Anyway he gassed as good as he could but couldn't check the temp. Go home, shower then back out a hour later and it blows cold straight away. Wtf. First time it's ever happened and that was a month ago.
Its happened quite often I guess?