2-4-3 Study of the fundamental theory, maintenance, and repair of automobile air conditioning and heating systems. Emphasis is placed upon subject matter recommended by industry through the National Automotive Technicians Education Foundation (NATEF). This course is designed to prepare students for the Automotive Service Excellence (ASE) certification exam in group 7: Heating and Air Conditioning. This course incorporates substantial " hands-on" training with both demonstrator units and customer vehicles in the Automotive Technology Center. Topical coverage include both R12 and R134a systems. Prerequisite: AT 121.