When refrigerant reaches the Air Conditioning Evaporator, it is a cool, low-pressure liquid. The evaporator returns the liquid back into a gas again because gas does a better job of absorbing heat. With the heat gone, the adjacent fan can now blow cool air into the cabin of the car. Although evaporators don’t fail very often, replacing them can be costly due to the complexity of the labor involved; this component is usually buried deep beneath the instrument panel.