The location of car air conditioner filters varies by vehicle model. Common positions include the rear of the drainage channel under the front windshield or the interior and surrounding area of the glove compartment on the passenger side. For example, German cars like the Volkswagen Touran and Sagitar mostly place the filter under the glove compartment, while the Passat has it at the lower left of the engine bonnet. Japanese cars such as the Honda Civic and Toyota Corolla are usually designed with the filter at the rear of the glove compartment. American cars like the Buick Regal may have it installed at the lower left of the front windshield on the engine bonnet, and Korean cars like the Kia Cerato are mostly equipped with it at the rear of the glove compartment. When installing, attention should be paid to the direction: the outer coarse filter surface should face the air inlet for layered filtration of dust. It is best to replace the filter every 10,000 kilometres or one year; if the environment is harsh, the replacement interval can be shortened to half a year. When replacing, you can operate by removing the glove compartment or the plastic cover of the engine bonnet. If the filter is not seriously dirty, it can be cleaned with compressed air, but it should not be washed with water to avoid damaging the activated carbon layer. Regular replacement can filter impurities such as pollen and dust, and ensure the air quality inside the car.