Automobile air-conditioning evaporators and fans have been in a closed and dark state for a long time, and the internal environment is hot and humid. After the impurities, dust, bacteria, and viruses in the air enter the inside of the air conditioner, they bond with the condensed water and block the evaporator and other components. Over time, a large amount of dirt, nicotine, mold, fungus, etc. adhere to it.
This situation is mainly caused by the structural characteristics of the air-conditioning system itself. The air-conditioning system mainly uses fluorine or 134A as the medium, and the purpose of refrigeration is achieved through the transformation of system pressure. It consists of evaporator, expansion valve, compressor, blower, condenser, drying tank and pipeline. When the air conditioning system is working normally, the evaporator is working in a cold environment, and water will be produced when it encounters relatively hot air from the outside. This is also the principle of designing water pipes in the evaporator structure; the humid environment of the evaporator and the ventilation pipe The dust on the surface provides a breeding ground for mold and fungus.