... the engine through the furnace cavity circulate heating.In such a way,gradually incrase the temperature of engine,warm blower,water ... immediately. 4.Compact structurre,eay installation .Convenience service ,when you buy a new car ,the heater can dismantle and install on the ... can close the engine and start the heater,in such a way,you can save 90% fuel. 6.Save the fuel ...