The air conditioning unit maintains comfort in the passenger compartment by switching inside / outside air, adjusting air volume, dehumidifying / cooling with a heat exchanger, adjusting the temperature of the heated air, switching the air outlet.
It is called Heating Ventilation and Air Conditioning (HVAC).
By circulating the refrigerant (Compressor→Condenser→Expansion valve→Evaporator→Compressor) inside the Air-Conditioning system. It takes heat from the passenger compartment (by heat absorption) and dissipates heat to the outside of the vehicle compartment.
The automatic air conditioner controls the air temperature, air flow volume, and the air outlets to control the interior to the set temperature. It is achieved based on the conditions detected by each sensor such as inside temperature, outside air temperature, solar radiation amount, water temperature (engine cooling water temperature) and switching the inside / outside air automatically.