Thanks for the help, Steve. More info
The first time this happened, I drove about 30 miles home before turning the car off. Then about an hour later, I went back and started the car and it worked fine. That was last weekend. Today, after it quit blowing cool air ( I assume this means the compressor has shut off), I turned off the switch. I turned it on again a few minutes later and it worked fine for about ten minutes before it quit again.
I tried doing a search earlier. I got many responses, but none that looked relevant. I will try again using some specific words from your post.
Thanks again for your help.