- Buick Ownership
2 days after the valve cover was replaced and oil pan was resealed for oil leaks. The a/c stopped working all of the time. Sometimes it works sometimes it doesn't. Just drove it on a weekend trip. On the way out it worked for about an hour and a half and the stopped and would not work again, until the following day. Last week it would stop halfway to a 12 mile drive to work. Took it in once to have it looked at they did an inspection and made sure there was refrigerant and no leaks. Any thoughts? It's a 2014 with 55,000 miles on it. Thanks.