The air conditioning heat exchanger(Heater) is a component that utilizes the heat of coolant and uses a fan to blow it into the cabin to heat.The main function of the car air conditioning heating system is to adjust the air to a comfortable temperature with the evaporator.In winter, it provides heating to the car interior and increases the ambient temperature inside the car. When the car’s glass is frosted or foggy, it can deliver hot air to defrost and defog.