Many car air conditioners will smell strange smell, like sour taste, like the smell of feet that have not been washed after 10 thousand steps; This smell will be obvious when using ventilation mode (natural wind), but it will be "fleeting" when the cold air conditioner is turned on by default. However, it is not that the substance that causes this smell does not exist, and the low temperature air will reduce the molecular activity, that's all.
The sour taste is caused by dead mold and rotten mold in the evaporation box of automobile air conditioner, which will breed in humid environment; After the spring rain, there may be a lot of mold in the evaporation box and air conditioning duct, which will still have some impact on health.
Therefore, it is necessary to clean the evaporation box and pipeline, but the cost of disassembly and cleaning is too high, which is easy to produce abnormal noise; The cost of cleaning with detergent is not low, and the car can be cleaned directly with warm air.
The warm air box (heat exchanger) and evaporation box of an automobile are basically next to each other.
Mold can be killed in 20 minutes in the environment above 80℃, and the temperature of the warm air box of the car is very high, which will be equivalent to the temperature of the antifreeze coolant; The principle of realizing warm air is to "iron" the water tank with the antifreeze coolant heated by the engine, then blow low-temperature air on the water tank with a blower to iron it, and finally mix different proportions of natural air to adjust the temperature and send it into the car.
Generally, the antifreeze coolant temperature of automobiles is above 90℃, and some automobiles will reach 100℃ or even close to 130℃ (high-performance automobiles). Therefore, as long as the hot car state is reached and the warm air is turned on, the temperature of the warm air tank will be high enough to clean the mold in the evaporation box; At this time, the internal circulation is started, so that the air in the car is heated up continuously through the water tank, and the air volume is adjusted to the maximum, which is enough to clean the air conditioning pipeline.
Finally, it is necessary to open the external circulation and the door, so that the outside air can circulate the air in the car and blow away the turbid air in the car, which can play an effective cleaning role.
The idle time of hot car is suggested to be half an hour. Electric or plug-in hybrid vehicles can be fully charged first, and then continue driving for one hour in pure electric mode.
However, the mold will continue to appear, so just clean it up next time you can smell it.
Some cars will have a decrease in cooling effect, or just feel a decrease but actually don't. At this time, the repair shop will always advise the owner to add "snow species"; The so-called snow seed is refrigerant, and R- 134a (tetrafluoroethane) is widely used now.
In fact, there is no need to add it, because snow species will not deteriorate! The principle of refrigeration is only to absorb heat by changing the shape of snow with extremely low boiling point, from gas to liquid and then back to gas, without causing deterioration of refrigerant. So as long as it can cool down normally, there is no need to change the snow species. What if the cooling effect really drops?
Don't leak the snow in the cold air conditioner, on the contrary, it is caused by hardware damage! At this time, what needs to be done is maintenance and replacement. It's nothing more than drinking poison to quench thirst. Fill it up or leak it. Tetrafluoroethane leakage is always dangerous. Therefore, the air conditioner should be overhauled without refrigeration, and the evaporation box can be thoroughly cleaned at the same time. There is nothing special to pay attention to in other aspects. Just be careful not to catch cold during use.