... demisting effect ;4 . The inner spiral copper tube heat exchanger and windowed aluminum sheet , high heat efficiency , good pressure resitance ... original brand Compressor , Clutch , Heater , Defroster , Radiator , Fan , Valve and so on . Our company passed the ISO9001: 2008 international quality ... us , thanks ! ~ With European Research New Brand Cool and Warm Defroster Series for Bus/Truck/Car/Vehicle