... 3.Certificaiton: ISO9001; 4.100% new Fresh Air Defroster Series / Bus Front Heater for Truck / Engineering Vehicle/Bus Our company ... , long service life ;4 . With the control panel and the regulating valve , which can realize the automatic constant temperature ... brand Compressor , Clutch , Heater , Defroster , Radiator , Fan , Valve and so on . Our company passed the ISO9001: 2008 international quality ...