Why is my car's AC not working? With temperatures outside over 100 degrees this is a huge inconvenience. Whether it is blowing hot air or no air at all the best place to start is with an AC system diagnostic check. This is because several factors could be causing this problem. One possible reason is low refrigerant levels, which play a crucial role in cooling the air. Another potential issue could lie with the compressor, responsible for circulating the refrigerant. Problems with the condenser or evaporator can can cause issues with the AC's cooling capacity. During a diagnostic check the AC fan will also be checked because a broken fan can limit airflow. Other factors like a clogged air filter, or electrical glitches could add to the problem as well. If your car's AC is not working, the best place to start is to take it to a qualified auto mechanic. Our team at Express Automotive in Blanco, TX can diagnose the problem and fix it for you.