Hello, I am currently working as a maintenance technician. During the change of seasons, if you alternate between using the heater and air conditioner, you may notice an unpleasant smell coming from somewhere without realizing it. Based on my experience, I believe that dust and mold inside the air conditioner are the main causes of the smell. If it is in a very serious condition like the one in the picture, you may need to disassemble it, but it is a huge task to remove the air conditioner for cleaning. Therefore, I will explain a simple way for anyone to eliminate the smell from the heater and air conditioner and to eradicate mold spores. First, remove the air conditioner filter of the car and spray a small amount of air back cleaner on the blower motor located under the filter. Then close the lid again. This is the first step to remove the dust attached to the blower motor. Come back to the driver's seat, start the engine, and set the indoor temperature and fan speed to the maximum. Also, make sure to block the outside air.

Position yourself facing the wind and close everything. The purpose of the coolant is to rise up to a maximum of 110 degrees for the purpose of eliminating mold and bacteria inside the air conditioner. When everything is completely sealed off like this, if you wonder where the air goes, it comes out to the outside through the air conditioner's water drain hose. Even if you started the engine for a moment, you can see that the temperature has risen. Once the temperature has completely risen, wait for about 10 minutes. After 10 minutes, turn off the engine, put in the air conditioner filter, and finish the job. Give it a try once. The smell disappears like magic. Was it helpful? Thank you for watching until the end.

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