We are on the road near Memphis and it is 90 degrees. Our AC isn't working. We are on our third AC unit in several months and this one has been used for 4 days so far. It worked fine until last night...
If it has an air intake blocked it could be icing up. I had this happen in Yellowstone a few years ago. Seems totally counter intuitive but try running the fan only for a while with the a/c off. If it is icing up then the warmer air going across the coils will thaw it out so you can start getting cooler air again. Same thing can happen if a duct is blocked, or it has been running continously for a few hours.