Somewhat of a strange problem with the A/C on my 2000 SE. A month ago, went from arctic air to hot air. Took it in and it was found to be a pound low on freon and my mechanic could detect no leaks (he did put dye in the system.) Was very arctic until today. Ran it for an hour on Max A/C and all of a sudden the A/C cut out and nothing but hot air. Shut the car down and went to dinner. Came out and started it again and the air was arctic for a 1/2 hour until it turned hot again. Stopped again, restarted and it did it again. Any ideas?