Good afternoon my name is Tom Brintzenhofe, Certified Master Mechanic out of Reading, Pennsylvania. Today I'm going to talk a little bit about how does an air conditioner work. It is pretty much a simple operation. It is basically just a chemical operation a chemical reaction. Basically your compressor will take a gas and convert it into a liquid and that change from a gas to a liquid will give off the cool air and as it is moving down through and I don't know if you have ever seen the liquid refrigerant which is R134A is extremely cold and if you ever get it on your skin it will cause you frostbite. Now as it pumps through the system it is basically going through a heater core type, it's just a big honeycomb. As it is flowing through this comb that chemical reaction it is going to make this thing really cold and as it is blowing air across this thing it is blowing cool air into your the cabin. Other than that is runs up through almost like a radiator type in front of the vehicle and as it is coming, it is pulling the heat from there. The reaction up front the air that is flowing through this cooler actually turns it back into a liquid and then the suction line pulls it back through your compressor. It is just a continuous cycle going back through but basically that's all an air conditioning unit is is just one big chemical reaction that circulates your Freon freezes the evaporator core in there and that blows air across and makes it nice and cold but that is the simplest way I can describe how an air conditioner works.