The Audi A4 Evaporator is the component of the air conditioning system that actually cools the cabin by absorbing the heat of the interior air quickly. The Evaporator is made of aluminum tubes and thin fins, which can be found under the dashboard in an Audi A4 cabin, and has the high possible surface area to allow the refrigerant to contact more metal and collect heat faster when it is in operation. As the blower forces the warm cabin air over these cooled fins, the liquid refrigerant contained in the tubes vaporizes, a change in state that absorbs heat in the airflow. With changes in heat, moisture within the incoming air cools down on the Evaporator surface, gathers at the bottom of its casing, and drains out of the case, reducing humidity inside the vehicle. This two-fold effect offers cooling and dehumidification to the occupants in the Audi. Since the component is subjected to continuous changes in temperature and may be full of decomposing debris on the outside air intake, corrosion or cracking can eventually cause leaks in the sealed refrigerant passages and loss of cooling capacity. Stagnant water can also be formed by a blocked drain, which will hasten the degradation and form a conspicuous smell. The small size of the Evaporator makes the air route short in order to achieve effective climate control, and as a result, the overall level of comfort expected in an Audi A4. Despite being rather basic in its idea, this element is still required in any Audi climate system.
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