 To hear more science and engineering news, including the researchers making it, subscribe to NSF's Discovery Files podcast. This is Sarah at Stotts Automotive. Is your air conditioning blowing but not getting cold? The most common cause of this is a low freon level. So get it serviced at Stotts Automotive. We will pressure test it and add up to one pound of refrigerant. For the R134A system, it's $85.95.