Neglect of auto air conditioning service is one of the chief reasons why so many people are caught taking their vehicles into the shop for air conditioning repair on the hottest days of the year. A C equipment seems to break down and quits at the most unfortunate of times. So don't have yourself caught in the heat of summer with your air conditioning needing repairs. Some common problems with auto air conditioning are refrigerant leak, faulty air compressor, faulty condensor, and faulty relay.