The Air Conditioning is the "AC" in HVAC.  It is comprised of the compressor, condenser, evaporator, orifice tube, belt along with many hoses, relays, sensors and switches.  When the air conditioning is not working properly, it may just need freon and recharged.  Since freon is a gas, there is a dye that is put in with the freon so that any leaks can be seen under a black light.  If one of the parts in the system is leaking, we will then be able to see which one.  Even though air conditioning is important to keep those in the vehicle cool, it is also necessary in keeping your vehicle cool.  If your air conditioning quits working, give us a call so we can make sure it isn't a vital part in cooling your vehicle.