Inside the car, as space, seats, handles and machinery get hot from the exterior and interior heat including sunlight, air, roads and engine, the air-conditioner starts to operate. The car air conditioner/heater is a combination of a heater and a cooler. The cooler controls cooling, and removing humidity by alternating the process of compressing-condensing-expanding-evaporating the refrigerant of the air-conditioner, and the heater systematically controls heating through the process that heated cooling water circulates into the heater. Thus they make the interior of the car pleasant.
The...