The evaporator is located inside the cab of the vehicle and is a critical part of the HVAC unit that keeps the inside of your vehicle at a comfortable temperature. As liquid refrigerant enters the evaporator from the condenser, air from inside the vehicle is run over the evaporator's tubes. As the hot air from inside the vehicle runs over the evaporator, the cool liquid refrigerant heats up and turns into a gas, cooling the air. Once the air has been cooled, it is blown back inside the vehicle by a blower fan.